I have two grammars, ______are of great use. A．all of whichB．either of whichC．bo

题型：不详难度：来源：

I have two grammars, ______are of great use.

A．all of which

B．either of which

C．both of that

D．both of which

答案

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.

举一反三

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A．that

B．which

C．it

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A．which

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A．where

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A．that

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