We ___________ try our best to fight against pollution.（ ）
| A． |
should |
B． |
may |
C． |
mustn't |
D． |
needn't |
We ___________ try our best to fight against pollution.（ ）
| A． |
should |
B． |
may |
C． |
mustn't |
D． |
needn't |
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