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
You must have seen a lot of interesting movies, ______
A．don't you
B．did you
C．must you
D．haven't you
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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