– 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 doneD．were polluting, must be done

C

解析試題分析：句意：看看這些工廠。我討厭它們，它們已經(jīng)污染了很多這里的河水。是的，必須做一些事情來阻止污染。根據(jù)語境，應(yīng)該用現(xiàn)在完成時表示已經(jīng)做了某事，一些事情必須被做，情態(tài)動詞的被動形式must be done,故選C
考點：動詞的時態(tài)及被動
點評：動詞的時態(tài)是學(xué)習(xí)英語過程中非常重要的知識�，F(xiàn)在完成時表示動詞在過去發(fā)生對現(xiàn)在造成的影響�，F(xiàn)在完成時往往和already,yet,for+一段時間，since+點時間的時間狀語連用。一般過去時只表動詞在過去發(fā)生，一般現(xiàn)在時表示習(xí)慣性的動詞或是客觀真理、事實。

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