單項(xiàng)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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1.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

2.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

3.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

4.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

5.單項(xiàng)選擇題--We want to sit at the table near the window. -- I‘m sorry, but（）already.

A.it took
B.it takes
C.it is being taken
D.it has been taken