问题
选择题
Please tell Tom not to leave the classroom unless he ______ that all the lights ______.
A．makes sure; are turned off
B．makes sure; will be turned off
C．is made sure; are turned off
D．will make sure; will be turned off
答案
A
题目分析：句意：请告诉Tom离开教室前确保所有的灯都被关掉。第一空he和make sure是主动关系，第二空all lights和turn off之间是被动关系，故用被动语态。故选A。