汉译英
【小题1】当你离开教室的时候, 应该随手关灯。(ought to)
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【小题2】对学生们来说,按时完成作业是很重要的。(be important to)
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【小题3】母亲节那天我给妈妈买了件礼物。( buy for )
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【小题4】这道物理题这么难,我做不出来。( so… that )
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