【題目】—_________ was light bulb invented ________ ? —Thomas Edison.

A. When, / B. Who, by

C. Who, / D. What, for

【答案】B

【解析】

試題分析:句意為:---白熾燈是由誰發(fā)明的?---托馬斯.愛迪生。When提問時間,who提問主語是誰,what提問事物是什么。根據(jù)語境,這里詢問的是動作的執(zhí)行者是誰,通常應(yīng)用by引出動作的執(zhí)行者。故應(yīng)選B。

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