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
Little ______ that the police are about to arrest him.
A) he knows
B) he doesn't know
C) does he know
D) doesn't he know
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
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