I have two grammars, ______are of great use.
类型:单选题
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:
本题考点是非限制性定语从句,先行词指物,且前有介词,作介词宾语时,用which. 本题中,先行词grammars,指物,表示“两者都”,用both,且前有介词of,作介词宾语, 用which, 故用both of which。本句句意为:我有两种语法书,他们都非常有用。
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