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(   ) 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省略了谓语动词do, 后边表示目的所以用to stop。故选B。

题目来源:仁爱英语同步练习簿九年级上下册 > Topic 2 All those problems are very serious.

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