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

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

A 【解析】句意：你知道物理學(xué)上的那個偉大方程E＝MC2嗎？考查定語從句引導(dǎo)詞辨析。A. which用于先行詞是物時，引導(dǎo)限制性定語從句；B. that用于先行詞是不定代詞、最高級、序數(shù)詞等時；C. in which用于先行詞是物且有介賓關(guān)系時；D. what用于先行詞是事時。本句先行詞the equation E = mc2是物，需用which引導(dǎo)；根據(jù)句意結(jié)構(gòu)，可知選A。
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