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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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