A
1.have to
2.mustn t
3.have to
4.has to
5.mustn t
6.don t have to
B
C
2.have to
3.mustn t
4.mustn t
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A
1.have to
2.mustn t
3.have to
4.has to
5.mustn t
6.don t have to
B
1.have to
2.mustn t
3.have to
C
1.have to
2.have to
3.mustn t
4.mustn t