单项选择题

He got a message from Mike ______ Professor Li couldn't see him the following day.

A. which
B. whom
C. that
D. what
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I don't doubt ______ the stock market will recover from the economic crisis.
A. if
B. what
C. that
D. which
单项选择题
She didn't go to the party last night, ______ she had to finish her term paper.
A. if
B. though
C. till
D. because
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