—I’m leaving now.— you turn off the lights and the computer.A. To make sureB. Make sureC.

问题补充：

—I’m leaving now.

— you turn off the lights and the computer.

A. To make sure

B. Make sure

C. Made sure

D. Making sure

答案：

A. To make sure

(答案→)B. Make sure

C. Made sure

D. Making sure

解析：考查祈使句的用法。句意是：确保你关了灯和电脑。这是一个祈使句，空后面的内容是Make sure的宾语从句；祈使句省略主语you，以动词原形开头。