问题

There is a new problem involved in the popularity of private carsroad conditions need

A:that；to be improved
B:which；to be improved
C:where；improving
D:when；improving

正确答案是：

同类题型

You never feel worried before an exam, do you— Well, I work hard all the time. I’m _________ any exam.

If you want to succeed, you have to it[ ]

Thosewhosinging may join us

edtogethomebeforedark,butitdidn’tquite________asplanned

I didn’t hear you in just now.—That’s good. We tried ________________ you up.