2. 外语
  3. The suggested causes of a given phenomenon cannot always be independently observed, and so it is hard to ______ the possibility

The suggested causes of a given phenomenon cannot always be independently observed, and so it is hard to ______ the possibility

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问题 The suggested causes of a given phenomenon cannot always be independently observed, and so it is hard to ______ the possibility of there being explanations alternative to the one proposed.
选项 A、account for
B、rule out
C、guard against
D、do with
答案B
解析 account for解释；guard against防备；do with可以用have/be to do with something“与某事有关”；上述三项，均与题义不符。rule out“排除……”，用在此句中，意思是“很难排除其他一些可能的解释”，意思通顺。
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