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题目内容
（西安科技大学-大学英语1）
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
under a constant emotional strain.
A、
to compete
B、
competing
C、
to be competed
D、
having competed
参考答案