His parents ________ doctors.

A. are allB. are bothC. all areD. both are
2025-05-21 01:51:40
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回答(1):

答案B
parent指父母两人中的任意一个,parents必指父母两个人.both是指两者,放于be动词之后.
参考:http://www.zuoyebao.com/q/14546