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    【题目】Although repetition helps memory, psychologists doubt ________ it helps long-term memory.

    A.whyB.howC.whetherD.what

    【答案】C

    【解析】

    考查whether引导的宾语从句。句意：虽然重复有助于记忆，但心理学家怀疑它是否有助于长期记忆。A. why为什么；B. how如何，怎么样；C. whether是否，不论；D. what什么，多么。根据psychologists doubt可知动词doubt后接宾语从句的肯定句，因此此处要用whether引导宾语从句。故选C项。

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