Air pollution may cause problems and even cancer.A. breathe B. breathesC. breathing D. breathed 题目和参考答案——青夏教育精英家教网—

题目内容

( ) 2. Air pollution may cause problems and even cancer.

A. breathe B. breathes

C. breathing D. breathed

2. C考查现在分词作定语修饰problems。

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