单项选择题

（） a crowd of spectators, Bill felt nervous.

A. Watched
B. Watching
C. Being watched by
D. Having watched

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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

单项选择题

That sentence was hard to understand, so I had to have my teacher ______ it for me.

A. to explain

B. explain
C. explaining

D. to be explaining

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