Iwaspraisedinclass,butIdidn’t___

发布时间：2020-07-27 02:42:02

I was praised in class, but I didn’t ________ know for the teacher had done so．A.whenB.whatC.whereD.while

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B解析for what在句子中应该是跟在do so的后面作状语，相当于why，所以
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