See to it that all the light (are) turned off before you leave.为什么写are?为什么 should be不行.
问题描述：
See to it that all the light (are) turned off before you leave.为什么写are?为什么 should be不行.
答
See to it that all the light (are) turned off before you leaveSee to it留意必定做…that 定从it=all the light (are) turned off before you leave all the light 所有的灯 turn off 关闭before you leave在你...