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【题目】If he doesn't study hard, he will fall behind others. (保持句意基本不变)

He will fall behind others ________ he ________ hard

【答案】unless studies

【解析】

句意:如果他不努力学习,他就会落后于别人。

此题为同义句转换,也可以说“除非他努力学习,否则就会落后于别人”,用unless除非;从句主语he是第三人称单数,study要变成studies。故答案为unlessstudies

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