The pollution problem here seems to get more and more serious .Something with it .A. has d

发布时间：2020-08-21 11:45:07

The pollution problem here seems to get more and more serious .Something     with it .
A. has done
B. must be done
C. is doing
D. was done

网友回答

A. has done
(答案→)B. must be done
C. is doing
D. was done
解析：此题重点考查含有情态动词的被动语态的基本构成和用法。
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