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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单项选择题
Smoking is not allowed here ______ .
A．at any time
B．at one time
C．at a time
D．at times
单项选择题
He regretted ______ so much time playing the computer games.
A．to waste
B．wasted
C．wasting
D．to be wasted
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