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單項(xiàng)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

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單項(xiàng)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

單項(xiàng)選擇題

Not until most of the people had left the airport（）his sister was there.

A.that he saw
B.had he seen
C.did he see
D.that he had seen

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