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精英家教網 > 高中英語 > 題目詳情

 Experts say that the rate at which one ages ______ from person to person and is usually influenced by a number of factors. 

A. is varying         B. varied             C. has varied           D. varies

D.

解析: 考查謂語動詞的形式。句意為:專家稱,人衰老的速度因人而異。衰老通常受多因素的影響。空白處的動詞應與主句的動詞和從句的第二個謂語的動詞形式一致,即用一般現在時。因從句的主語是the rate,故謂語用varies。

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