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They were surprised that a child should work out the problem____ they themselves could not.

A.onceB.unlessC.whileD.if

C

解析试题分析:句意:他们很吃惊,一个孩子竟然可以解决这个问题,而他们自己却不能。Once一旦 unless除非 while而 if如果,选C。
考点:考查词义辨析

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