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?


解析:

主句中的two表明不能選A，從句中的are表明不能選B，both of which用來引導(dǎo)非限制性定語從句。?

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