2. 外语
  3. The average age at which people begin to need eyeglasses vary considerably.

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

admin2011-01-13  42
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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