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 不定式to compete作pressure的定语“竞争的压力”。
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