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 --我現(xiàn)在要離開(kāi)了．--確定一下你把燈和電腦都關(guān)閉了．

解答 答案：B  聯(lián)系語(yǔ)境和漢語(yǔ)意思根據(jù)you  turn off the lights and the computer（你把燈和電腦關(guān)上），可知這是表示叮囑的祈使句，其結(jié)構(gòu)為動(dòng)詞原形+其它；又知to make sure是不定式結(jié)構(gòu)，放在句首做主語(yǔ)，通常表示目的，其后謂語(yǔ)動(dòng)詞用單數(shù)；made sure是過(guò)去式；making sure是現(xiàn)在分詞，放在句首做主語(yǔ)．所以此處應(yīng)填make sure，故選B．

點(diǎn)評(píng) 此題考查祈使句．做題時(shí)，一定要熟知祈使句的結(jié)構(gòu)：動(dòng)詞原形+其它．祈使句可以表示命令，請(qǐng)求，叮囑，建議等等．

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