单项选择题

A. did we realizeB. we did realizeC. realized weD. we r……

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______.