The professor can hardly find sufficient grounds his argument in favor of the theory. A．which to base on B．on which to base C．to base on which D．which to be based 题目和参考答案——青夏教育精英家教网—

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The professor can hardly find sufficient grounds　 ________ his argument in favor of the theory.

A．which to base on　　 B．on which to base

C．to base on which　　 D．which to be based

考查“介词＋which＋to do”结构。句意：教授几乎不能找到足够的理由支持他的理论。base...on 意为“基于，作为……的基础”。

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A. make a comparison　　　　　　　　　　　　　　　　　　 B introduce a topic

C. describe a scene　　　　　　　　　　　　　　　　　　　　 D. offer an argument

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D. dreamed of cutting the sales agent’s head that night.

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C. Receiving bad news requires great courage.

D. Learning ancient traditions can be useful.

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