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They were surprised that a child should work out the problem _____ they themselves couldn’t.
A.whenB.whereC.untilD.while
D
考查连词辨析。while是个并列连词,表示“转折”,而其它连词均没有转折之意。句意:他们很惊讶一个孩子能够解决出这个问题,而他们不能够。
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