11. How can I ever concentrate (集中精力) if you ________ continually ________ me with silly questions?
A. haveinterrupted B. had interrupted
C. areinterrupting D. wereinterrupting
12. I bought this shirt for 35 yuan yesterday.
Its on sale today for only 29. You should have waited.
Oh, really? But how ________ I know?
A. would B. can
C. did D. do
13. Will you go now?
Not until I ________ my experiments.
A. will finish B. have finished
C. will have finished D. had finished
14. Look! Someone has spilt coffee on the carpet.
Well, it ________ me.
A. isnt B. hasnt been
C. hadnt been D. wasnt
15. Did you enjoy your holiday?
Yes, its the best holiday I ________ these years.
A. had B. have had
C. had had D. would have
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