There is a wide of reference books to be found, so you look for some material needed, you

There is a wide of reference books to be found, so you look for some material needed, you can turn to me.
A. kind; the last time
B. sort; every time
C. variety; next time
D. type; the moment

A. kind; the last timeB. sort; every time(答案→)C. variety; next timeD. type; the moment解析：句意：有各种各样的参考书可以被找到，因此下次你在找需要的材料时，你可以向我求助。短语：a wide variety of各种各样的，第二空：next time 引导时间状语从句。所以选C。

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