单项选择题

______ by the explosion, we all rushed out of the hall.

A) Frighten
B) Frightened
C) Frightening
D) To frighten
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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
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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