Itwasinthisverylab________wasinthechargeofProfessorJohn________they

发布时间：2020-08-05 00:31:48

It was in this very lab ________ was in the charge of Professor John ________ they did the experiment.A.where, thatB.which, whereC.that, whereD.which, that

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D解析本句是强调句中套了一个which引导的定语从句
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