中考英语时态专项练习(21)

　　16. Dont put the waste on the ground.

　　Oh, Im very sorry. I _____the dustbin there.

　　A. dont see B. isnt seeing

　　C. didnt see D. havent see

　　17. How is the weather in your country this summer?

　　It _____as much as it does now for a long time.

　　A. hasnt rained B. doesnt rain

　　C. wasnt raining D. didnt rain

　　18. Does Liu Hui serve in the army?

　　No, but he _____in the army for three years.

　　A. served B. has served

　　C. is serving D. would serve

　　19. Sorry. I _____to post the letter for you.

　　Never mind. _____it myself after school.

　　A. forget; Id rather post B. forgot; Ill post

　　C. forgot; Im going to post D. forget; Id better post

　　20. Unfortunately, when I dropped in, Professor Smith _____, so we only had time for a few words.

　　A. has just left B. had just left

　　C. just left D. was just leaving