Question

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

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

Answer 1

【答案】A

【解析】句意：你知道物理学上的那个伟大方程E＝MC2吗？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。