Only when class began ______that he had left his book at home．A．will he realizeB
题型：不详难度：来源：
Only when class began ______that he had left his book at home．| A．will he realize | B．he did realize | C．did he realize | D．had he realized |
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答案
| 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。 |
举一反三
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