We____ fight aganist pollution A.may B.should C.mustn't D.needn't

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We____ fight aganist pollution A.may B.should C.mustn't D.needn't
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We____ fight aganist pollution A.may B.should C.mustn't D.needn't
We____ fight aganist pollution A.may B.should C.mustn't D.needn't

We____ fight aganist pollution A.may B.should C.mustn't D.needn't
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