The pollution problem here seems to get more and more serious .Something ____wit
题型：不详难度：来源：
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 |
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答案
| B |
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。 |
举一反三
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