单项选择题

The computer teacher was talking with its students as if it（）a human teacher.

A. is
B. had been
C. was
D. were

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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
单项选择题
2（）

A. In the place of
B. In place of
C. Besides
D. Except
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