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【题目】When __________ such a difficult problem, he didn't know what to do.

A. facing B. faced

C. faced to D. facing with

【答案】A

【解析】句意:面对这样困难的问题,他不知所措。句子主语为he, face的逻辑主语也为he,因此有两种可能:facing faced with。选 A

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