[题目]Air pollution has become than ever before. We must do something to stop it.A.seriousB.more seriousC.most seriousD.the most serious 题目和参考答案——青夏教育精英家教网——

题目内容

【题目】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

【答案】B
【解析】句意：空气污染已经变得比以前更严重了．我们必须做些事情去阻止它。根据句中的“than ever before”可知是和以前比较，所以采用形容词的比较级，故选B。

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