单项选择题

The pressure （）causes Americans to be energetic, but it also puts them under a constant emotional strain.

A. to compete
B. competing
C. to be competed
D. having competed

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单项选择题
2（）

A. In the place of
B. In place of
C. Besides
D. Except
单项选择题
My father is a heavy sleeper now, but he used to rarely oversleep, （）he

A. isn’t
B. did
C. didn’t
D. is
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