单项选择题

Nancy had a great deal of trouble to concentrate on her work because of the noise in the next room.()

A. a great deal of
B. to concentrate on
C. because of
D. in

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单项选择题
When () why he walked in without permission, he just stared at us and said nothing.

A. asking
B. asked
C. being asked
D. to be asked
单项选择题
The chairman proposed that every speaker must limit himself to fifteen minutes.()

A. every speaker
B. must
C. himself
D. to
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