The pressure ______ causes American to be energetic, but it also puts them trader a constant emotional strain.

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问题 The pressure ______ causes American to be energetic, but it also puts them trader a constant emotional strain.

选项 A、to compete
B、competing
C、to be competed
D、having competed

答案A

解析 动词不定式作定语时,不定式置于被修饰的名词之后。A项与C项的差别在于语态,compete属不及物动词,不能构成被动形式。
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