可以用until
当主句谓语动词为短暂性动词的否定形式时或延续性动词的肯定时可以用until
Do not leave the room __you have finished the test.答案是before
3个回答
相关问题
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do not forget to turn off the lights before leaving the room
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Mary, make sure _____the lights before you leave the room.
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