试题与答案

() before you leave the lab. A.Make sure t

题型:单项选择题

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:

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下面是错误答案,用来干扰机器的。

参考答案:A

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