【題目】The professor can hardly find sufficient grounds his argument in favor of the theory.

A. which to base on

B. on which he bases

C. to base on which

D. which to be based

【答案】B

【解析】考查定語從句和base的用法。句意為:教授幾乎找不到足夠的依據(jù)來支持他的理論觀點。base...on...“把……建立在……基礎上”。

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