The average age at which people begin to need eyeglasses vary considerably.A、var

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问题 The average age at which people begin to need eyeglasses vary considerably.

选项 A、varies
B、is varied
C、will vary
D、has been varied

答案 A

解析结构应用主句主语为the average age，是单数，应用一般现在时的第三人称单数形式，因此A为答案。

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