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A. had attacked B. attacks
C. has attacked D. would attack
11. So difficult ______ it to work out the problem that I decided to ask Lily for help.
A. do I find B. did I find
C. would I find D. have I found
12. —Oh, Mr. Wang, I forgot the textbook again.
—You ______ something.
A. have left B. are always leaving
C. left D. did leave
13. —What ______ when I phoned you yesterday?
—I ______ my work, and I was going out.
A. have you done; finished
B. were you doing; finish
C. did you do; had just finished
D. were you doing; had just finished
14. No sooner ______ to the office than she got down to writing the report.
A. has she got B. did she get
C. does she get D. had she got
15. Lisa ______ a book about China last year but I don’t know whether she has finished it.
A. was writing B. wrote
C. had written D. has written
16. —How are you planning to travel to Beijing?
—I ______ yet, but I ______ taking a train.
A. didn’t decide; am considering
B. haven’t decided; consider
C. haven’t decided; am considering
D. hadn’t decided; have considered
17. —Have you finished the article?
—No, but I ______ it all this week.
A. write B. had written
C. have written D. have been writing
18. We first met in 1998, and from then on we ______ good friends.
A. are B. will be
C. have been D. had been
19. —Did you notice our head teacher just now?
—No, I ______ of something else.
A. was thinking B. thought
C. had thought D. have thought
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