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 该题是语法结构题,考查动词不定式的用法。在该句中动词不定式做定语。英语中有一些名词后跟动词不定式做定语,如ability,agreement,ambition,attempt,hope,dream等,如:his attempt to solve the problem他攻克这个难题的尝试/her dream to go to the moon她想去月球的梦想。选项B和选项D显然不合句子意义要求。选项C似乎正确,但动词compete是不及物动词,要与介词with或against连用,不能用于被动语态中。因此,根据题意和语法规则,选项A为最佳答案。
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