_____ it rain tomorrow, we would have to put off the visit to the Shanghai Museum.
A. If
B. Should
C. Were
D. Would
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_____ your letter, I would have written back two days ago.
A. If I received
B. Should I receive
C. Had I received
D. If I could have received
If Mother _____ me that truth when I _____ young, I would not make such mistakes so often now.
A. has told; was
B. told; was
C. told; had been
D. had told; was
If it were not for the fact that you _____ ill, I would ask you to do this right now.
A. were
B. had been
C. are
D. should be
If John Lennon and Paul McCartney _____, the pop music of today _____ very different.
A. didn't met; would be
B. didn't; would have been
C. hadn't met; would be
D. hadn't met; would have been