四级考试语法真题训练时态2

　　21.While people may refer to television for up-to-the-minute news, it is unlikely that

　　television______ the newspaper completely.

　　A. will replace B. have replaced C. replace D. replaced

　　22.The fifth generation computers, with artificial intelligence, _______ and perfected now.

　　A. developed B. have developed C. are being developed D. will have been developed

　　23.It s reported that by the end of this month the output of cement in the factory_______ by about

　　10%.

　　A. will have risen B. has risen C. will be rising D. has been rising

　　24.Sir Dennis, who is 78, has made it known that much of his collection ______ to the nation.

　　A. has left B. is to leave C. leaves D. is to be left

　　25.Before the first nonstop flight made in 1949, it_______ necessary for all planes to land for

　　refueling.

　　A. would be B. has been C. had been D. would have been

　　26.Until then, his family ______ from him for six months.

　　A. didn t hear B. hasn t been hearing C. hasn t heard D. hadn t heard

　　27.The conference_______ a full week by the time it ends.

　　A. must have lasted B. will have lasted C. would last D. has lasted

　　28.Great as Newton was, many of his ideas______ today and are being modified by the work of

　　scientists of our time.

　　A. are to challenge B. may be challenged C. have been challenged D. are challenging

　　29.It seems oil______ from this pipe for some time. We ll have to take the machine apart to put it

　　right.

　　A. had leaked B. is leaking C. leaked D. has been leaking

　　30.Once environmental damage ______, it takes many years for the system to recover.

　　A. has done B. is to do C. does D. is done

　　31.Neither of the young men who had applied for a position in the university ______.

　　A. has been accepted B. have been accepted C. was accepted D. were accepted

　　32.The last half of the nineteenth century______ the steady improvement in the means of travel.

　　A. has witnessed B. was witnessed C. witnessed D. is witnessed

　　33.If she doesn t tell him the truth now, he ll simply keep on asking her until she ______.

　　A. does B. has done C. will do D. would do

　　34.My train arrives in New York at eight o clock tonight. The plane I would like to take from there_______ by then.

　　A. would leave B. will have left C. has left D. had left

　　35.A thief who broke into a church was caught because traces of wax, found on his clothes, _____

　　from the sort of candles used only in churches.

　　A. had come B. coming C. come D. that came

　　36.She ought to stop work; she has a headache because she_______ too long.

　　A. had read B. read C. is reading D. has been reading

　　37.--- May I speak to your manager Mr. Williams at five o clock tonight?

　　--- I m sorry, Mr. Williams______ to a conference long before then.

　　A. had gone B. would have gone C. has gone D. will have gone

　　38.The growth of part-time and flexible working patterns, and of training and retraining schemes, ______ more women to take advantage of employment opportunities.

　　A. allow B. allows C. allowing D. have allowed

　　39.By the time he arrives in Beijing, we______ here for two days.

　　A. will have stayed B. shall stay C. have been staying D. have stayed

　　40.Such crimes may be so complex that months or years go by before anyone _______ them.

　　A. discovered B. will discover C. would have discovered D. discovers

　　答案

　　ACADC DBCDD CCBBA DDBAD