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

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

admin2009-09-17  46
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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