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

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

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

答案A

解析 此句是不定式做定语,在英语中有些名词,如动词变来的名词,形容词变来的名词,以及means,way, time,moment,reason等要求其后用不定式做定语,不定式没有体的变化。根据用法正确答案是A。
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