题目内容

【题目】 I have two grammar books, ___________ are of great use.

A. all of which B. either of which

C. both of that D. both of which

【答案】D

【解析】主句中的two表明不能选A;从句中的are表明不能选B;both of which用来引导非限制性定语从句。

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