I have two grammars, ______are of great use. A．all of which B．either of which C．both of t

I have two grammars, ______are of great use.
A．all of which B．either of which C．both of that D．both of which

D


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.

d

two 所以排除all （三者或三者以上）

are 排除either（两者中任一。。。谓语动词用单数）

c应该是them 而不是that

先行词grammars， 还原：both of (two grammars) are... 指物，作宾语，连词用which

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