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
科目：高中英語 來源： 題型：
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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