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选词填空表示义务/责任/不允许/不必的haveto,must和beallowedto,mustn't,don'thaveto的用法1.Igotobedearlytonight,I'msotired.2.Ileavenow,Mysisteriswaitingforme.3.Yousmokeherebecausetheysellpetrol.4.You

题目详情
选词填空
表示义务/责任/不允许/不必的have to,must和be allowed to,mustn't,don't have to的用法
1.I____go to bed early tonight,I'm so tired.
2.I____leave now,My sister is waiting for me.
3.You____smoke here because they sell petrol.
4.You____pay for that,It's free.
▼优质解答
答案和解析
1 have to
2 have to/must
3 mustn't
4 don't have to