—Which of his parents is a doctor?—______ are.

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问题 —Which of his parents is a doctor?—______ are.

选项 A、Any
B、Either
C、Both

答案C

解析 both表示两者都……后谓语动词be用复数，either表示两者中任意一个，后be动词须用单数，any表示三者或三者中任意一个谓语动词用单数。

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