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一、
1．needn't
2．must
3．can't
4．do
5．Need, must
6．Would
7．have to
8．May / Can; may /can
9．Shall
二、
1．have to
2．is able to
3．must
4．was, able
5．ought to
三、
1．C 2．C 3．B 4．D 5．D
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