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9. 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。

10. I want to use the same tools _______used in your factory a few days ago.

A. as was

B. which was

C. as were

D. which

答案：C. as引导定语从句时通常构成such…as或the same…as固定搭配，其中such和same修饰其后的名词，as为关系代词，指代其前的名词引导定语从句。as在从句中可以作主语、表语或宾语。本题中as作从句的主语。

11. My neighbors used to give me a hand in time of trouble, _______ was very kind of them.

A. who

B. which

C. that

D. it

答案：B. 非限制性定语从句常用which引导，which表示前句话的整个含义。

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