第1个回答 2009-06-04
The air pollution is becoming more of a question
第2个回答 2009-06-04
air polluting is becoming more than a problem.
第3个回答 2009-06-04
[A] becomes a problem of [B] more and more.
第4个回答 2009-06-04
XXX is more and more prblematic.
XXX=空气污染之类,即LZ的...