单项选择题

This is one of the longest bridges that ______ on this river.

A) is ever built
B) has ever been built
C) was ever built
D) has ever built
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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
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
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