(单选题)

There are three main classes of drugs, ______ has a different effect on the body.

A.all of which

B.of which each

C.each of them

D.and all of them

参考答案：B

参考解析：

考查定语从句。句意：主要有三种类型的药物，每一种对身体都有不同的作用。A项和D项中主语都有all来修饰，谓语动词应为复数，故排除；若选C项，则一个逗号连接了两个完整的句子，不符合英文的语法规则；B项中which指代的是先行词drugs，each指代的是每一种药，可以单独做主语，谓语动词用单数，故选B。

知识点：定语从句英语专业基础知识英语语法教师招聘-小学英语

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