单项选择题

It's necessary that the problem ______ in some way or other.

A．is settled
B．was settled
C．be settled
D．has been settled
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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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