—WhywasProfessorSmithsounhappyrecently?—Becausethetheoryheinsistedon___

发布时间：2020-08-06 19:29:02

—Why was Professor Smith so unhappy recently?—Because the theory he insisted on ________ wrong.A.provedB.provingC.to proveD.being proved

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A解析句中含有(that) he insisted on这一定语从句，prove在此用作主句谓语动词，因此选A．
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