Onlywhenclassbegan______thathehad

发布时间：2020-07-12 12:20:05

Only when class began ______that he had left his book at home．A.will he realizeB.he did realizeC.did he realizeD.had he realized

网友回答

C解析考查时态及主谓倒装，句意：只有当开始上课时，他才意识到他把书丢在了家里。结合语境可知本句描述的是过去发生的动作，故用过去时态。当only位于句首时，主句用部分倒装，助动词提前。故选C。
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