题目内容

5．-I'm leaving now．
-______ you turn off the lights and the computer．（　　）
A．To make sureB．Make sureC．Made sureD．Making sure

分析 --我现在要离开了．--确定一下你把灯和电脑都关闭了．

解答 答案：B  联系语境和汉语意思根据you  turn off the lights and the computer（你把灯和电脑关上），可知这是表示叮嘱的祈使句，其结构为动词原形+其它；又知to make sure是不定式结构，放在句首做主语，通常表示目的，其后谓语动词用单数；made sure是过去式；making sure是现在分词，放在句首做主语．所以此处应填make sure，故选B．

点评 此题考查祈使句．做题时，一定要熟知祈使句的结构：动词原形+其它．祈使句可以表示命令，请求，叮嘱，建议等等．

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