Onlyinthisway,directedbytheteache

发布时间:2020-07-11 15:07:36

Only in this way, directed by the teacher, ______work out the problem the day before













A.had they












B.they could











C.could they











D.did they

网友回答

D解析考查倒装句。当only位于句首是,主句采用部分倒装,助动词提前。句意:只有按照老师指导的这种方法,前一天他们才能解决这个难题。结合语境可知本句描述的是过去的动作,故用一般过去时态。助动词用did,选D。
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