单项选择题

We could not have fulfilled the task in time if it ______ for their help.

A. was not
B. is not
C. had not been
D. has not been
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He got a message from Mike ______ Professor Li couldn't see him the following day.
A. which
B. whom
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I don't doubt ______ the stock market will recover from the economic crisis.
A. if
B. what
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