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

A.whyB.howC.whetherD.what

【答案】C

【解析】

考查whether引導(dǎo)的賓語從句。句意：雖然重復(fù)有助于記憶，但心理學(xué)家懷疑它是否有助于長(zhǎng)期記憶。A. why為什么；B. how如何，怎么樣；C. whether是否，不論；D. what什么，多么。根據(jù)psychologists doubt可知?jiǎng)釉~doubt后接賓語從句的肯定句，因此此處要用whether引導(dǎo)賓語從句。故選C項(xiàng)。

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