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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单项选择题
He told me that I ____ be present at the ceremony.
A．could
B．would
C．should
D．might
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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