问题: 英语
Having checked that the doors were closed,and _____ all the light were off,the boy opened the door to his bedroom.为什么填when不填that
解答:
Having checked that the doors were closed放在句首是一个补充性的东西，你完全可以丢弃，后两段才是联系的，你可以把句子压缩为
_____ all the light were off,the boy opened the door to his bedroom.
现在你知道选择哪个了吧
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