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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

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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

單項(xiàng)選擇題

Not always（）they want (to)

A.people can do what
B.can people do what
C.people can not do what
D.can‘t people do what

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