题目内容
They ________ many bridges _________ the Pearl River in the last 10 years.
- A.have built; over
- B.built; over
- C.have built; on
- D.were building; on
A
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– Look at these factories. I hate them. They____ many rivers here.
--Yes. Something ______ to stop the pollution.
A.polluted, must do | B.had polluted , must be doing |
C.have polluted , must be done | D.were polluting, must be done |