问题
选择题
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
答案：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.
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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：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.