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    精英家教网 > 高中英语 > 题目详情
    They were surprised that a child should work out the problem____ they themselves could not.
    A．onceB．unlessC．whileD．if
    C

    试题分析：考查连词：A. once  一旦B. unless除非C. while当…时候，虽然，然而，D.if如果，句意：他们很惊讶的发现，一个孩子可以算出这个问题，而他们自己不能。选C。
    点评：连词的辨析要放在上下文总进行，同时要注意一些形式相近的连词的词义辨析。While的用法较多，也是常考的连词。
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