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