单项选择题

That is the reason ______ Mary failed to come to the meeting.

A．what
B．which
C．for that
D．why
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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
Fie regretted ______ so much time playing the computer games.
A．to waste
B．wasted
C．wasting
D．to be wasted
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