I have two grammars, _____are of great use.

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问题 I have two grammars, _____are of great use.

选项 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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