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    11、 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

    11、D.

    解析： 考查谓语动词的形式。句意为：专家称，人衰老的速度因人而异。衰老通常受多因素的影响。空白处的动词应与主句的动词和从句的第二个谓语的动词形式一致，即用一般现在时。因从句的主语是the rate，故谓语用varies。

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     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

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