单项选择题

I told him how to get here but perhaps I ______ him a map.

A．should have given
B．ought to give
C．had to given
D．must have given
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单项选择题
How is it ______ your roommate's request and your's are identical
A．that
B．so
C．if
D．what
单项选择题
Not until I began to work ______ how much time I had wasted.
A．have I realized
B．I have realized
C．did I realize
D．I realized
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