问题

Better _____ all the lights are turned offbefore you leave the classroom．

A:to be sure
B:to make sure
C:be sure
D:make sure

正确答案是：

同类题型

I don’t believe you can do today’s job with yesterday’s methods and be in business tomorrow，?

He got up very early that day ________ hecaught the first train

I think that no one wants to ____. [ ]

ately, people they met in the remote villagewere quite easy

Do you have time _____the weekend