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
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