—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：句意：我现在要走了。——确保你关上电灯和电脑。结合语境可知下文为祈使句，英语祈使句描述的是客观性动作，故用一般现在时态。其逻辑主语是第二人称，故谓语动词用原形。

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