【人教大纲版】2017届高考英语一轮复习精品学案：SBⅡ Units 7-8_高考复习指南

　　SBⅡ Units 7-8

　　重点句型

　　1. …and leaves a person defenceless against infections and illnesses.(SBⅡ U7)

　　……使人丧失对感染及疾病的抵抗力。

　　leave vt. 让……处于某种状态

　　①Please excuse me if I __________________(对你的任何问题都没有回答)．

　　②Extremely angry, Mum walked away and __________________(留下我一人坐在那儿).

　　③I __________________(让门开着)when I leave in case he comes back.

　　④It should be better to __________________(让他自个儿做).

　　【答案】

　　①(have) left any of your questions unanswered

　　②left me sitting there all by myself

　　③will leave the door open

　　④leave him to do it himself

　　2. Learning about first aid is the best way to make sure that we will not have to feel that we could have done more.(SBⅡ U8)

　　学习急救是保证遇到此类事情不留遗憾的最佳途径。

　　could have done 的用法：

　　（1）用于肯定句、否定句或疑问句中，对过去的动作进行可能性推测，也可用can have done。用于肯定句中相当于may/might have done。例如：

　　He can/could have left earlier. (can/could have left相当于may/might have left)

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