单项选择题

Study hard, ______ you will fail in the final examination.

A. or
B. and
C. but
D. for
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单项选择题
There are only ______ days left before summer holidays.
A. a little
B. little
C. a few
D. many
单项选择题
That is the reason ______ Mary failed to come the meeting.
A. what
B. which
C. for that
D. why
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