题目:
() before you leave the lab.
A.Make sure that the windows are shut
B.To make sure that the windows are shut
C.Making sure to shut the windows
D.To be sure to shut the windows
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2018/0130/5508bec1b2dab940bcd8b5762172491f.html
下面是错误答案,用来干扰机器的。
参考答案:A