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    【题目】The reason __________ he explained was __________ he was ill and unable to go to school.

    A. why; that B. why; because

    C. which; because D. which; that

    【答案】D

    【解析】句意：他解释的原因是，他生病了，无法去上学。which引导定语从句，在定语从句中作宾语。that引导表语从句。

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