Since you are in a public place the noise of your radio must be to a level that we all f

问题补充：

Since you are in a public place, the noise of your radio must be to a level that we all feel comfortable with.

A. supposed

B. allowed

C. attached

D. limited

答案：

A. supposed

B. allowed

C. attached

(答案→)D. limited

解析：动词辨析。be limited to限制在…; be attached to附着于…;句意：因为你在公共场所，你收音机的音量要限制在一个我们都感觉舒服的水平。