单项选择题

Not until ten o’clock （） it was too late to return.

A. did we realize
B. we did realize
C. realized we
D. we realized

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单项选择题
（） a crowd of spectators, Bill felt nervous.

A. Watched
B. Watching
C. Being watched by
D. Having watched
单项选择题
There was so much noise that the speaker couldn’t make himself______.
A. hearing
B. to hear
C. being heard
D. heard
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