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單項選擇題

In China, children（）school at seven.

A.has to start
B.must to start
C.have to start
D.can start

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單項選擇題

I（）finish my homework now. I can do it at the weekend.

A.have to
B.don‘t have to
C.must
D.mustn‘t

單項選擇題

People wandering in the fairground or park area（）wear a uniform.

A.must
B.mustn‘t
C.have to
D.don‘t have to

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