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

A. each of them B. all of them

C. each of which D. all of which

 

C

【解析】

試題分析：句意：藥物主要有三種分類，每一種對(duì)人的身體的影響不同。根據(jù)has可知主語應(yīng)該是單數(shù)，排除B、D；逗號(hào)后面沒有連詞，不能用each of them，如果在逗號(hào)后加一個(gè)and，則A也對(duì)；所以這里是非限制性定語從句，用which代替先行詞做介詞of的賓語，each of which一起做從句的主語，故選C。

考點(diǎn)：考查代詞+關(guān)系代詞引導(dǎo)的定語從句。

 

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