Air pollution has become__________ than ever before. We must do something to stop it. A．seri..
Airpollutionhasbecome__________thaneverbefore.Wemustdosomethingtostopit.A．seriousB．mo...
Air pollution has become__________ than ever before. We must do something to stop it. A．serious B．more serious C．most serious D．the most serious
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| B |
| 试题分析：根据下文than ever before可知表示和以前的对比，故用形容词比较级作表语，选B。 |
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