问题补充:
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
答案:
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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