问题

I think you should complain—_________ , of course, you are happy with the way things are

A:if
B:until
C:unless
D:once

正确答案是：

同类题型

My brother will go to America for further educationthis summer.— _________ Actually, we have many good universitieshere at home.

Did you hear the news about the fire in our building—Yes. It took the firemen two hours to __________ the fire.

She told me the earth ____ around the sun.

“Have a nice day!” is a wonderful expression, _____ us, in effect, to enjoy the moment and tovalue this very day.[ ]

My book was here a second ago but now it’s missing. Someone ________ a joke on me.[ ]