that all the lights are off before you leave the classroom. A．Find out B．Learn b
来源：网络
时间：
推荐文章
________ that all the lights are off before you leave theclassroom.
A．Find out
B．Learn by heart
C．Make sure
D．Be careful
试题答案
答案：C
提示：| find out找出，发现，learn by heart用心学习，makesure肯定，be careful小心
|