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-Look!Howdirtytheriveris!   -Butit

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问题详情:

-Look!Howdirtytheriveris!   -Butit

-Look! How dirty the river is!

    -But it ________ clear before a factory was set up nearby.

    A. used to be  B. will be   C. has been D. is

【回答】

A

知识点:动词和动词短语

题型:选择题

标签:butit