◎ 题干
I have two grammars, ______are of great use.
A.all of whichB.either of whichC.both of thatD.both of which
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“I have two grammars, ______are of great use. A.all of whichB.either of whichC.both of thatD.both of which…”主要考查了你对  【状语从句】【限制性定语从句】【主语从句】【同位语从句】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。