问题

There is a system ________the waste is disposed of using the principles of ecology.

A:which
B:where
C:that
D:at which

正确答案是：

同类题型

I will take an important test tomorrow. —Oh, really _______!

Is the girl really that woman’s daughter But she doesn’t __________ her at all. —But sure she is. She takes after her father.

Thanks for listening to my problem and giving me advice, Lily.— _______. That’s what friends are for.

Would you like to give me some advice on how to look children — Why not watch “Dad is back” on Zhejiang TV Station

The road was so narrow that there would betraffic jams____, especially during the rush hour.