【題目】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:面對這樣困難的問題，他不知所措。句子主語為he, face的邏輯主語也為he，因此有兩種可能：facing 或 faced with。選 A。

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