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【题目】Do you know the equation E = mc2 , _______ is a great achievement in physics?

A. which B. that C. in which D. what

【答案】A

【解析】句意:你知道物理学上的那个伟大方程E=MC2考查定语从句引导词辨析。A. which用于先行词是物时,引导限制性定语从句;B. that用于先行词是不定代词、最高级、序数词等时;C. in which用于先行词是物且有介宾关系时;D. what用于先行词是事时。本句先行词the equation E = mc2是物,需用which引导;根据句意结构,可知选A。

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