2. 外语
  3. The pressure______causes Americans to be energetic, but it also puts them under a constant emotional strain.

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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