Question

I'm leaving now , _______ you turn off the lights

Answer 1

问：I'm leaving now , _______ you turn off the lights

答：笞案:B联系语境和汉语意思根据 you turn o升fthe 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.