(   ) 5. We should do everything we can      air pollution.

A. stop    B. to stop

C. stops    D. stopping

5. B everything后的we can省略了謂語(yǔ)動(dòng)詞do, 后邊表示目的所以用to stop。故選B。

題目來(lái)源：仁愛(ài)英語(yǔ)同步練習(xí)簿九年級(jí)上下冊(cè) > Topic 2 All those problems are very serious.

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