We____ fight aganist pollution A.may B.should C.mustn't D.needn't
问题描述：
We____ fight aganist pollution A.may B.should C.mustn't D.needn't
答
选B
首先根据句意排除CD
然后may是可能,表推测；should是应该,
这里说对抗污染当然是应该对抗污染了