单项选择题
A.has to start B.must to start C.have to start D.can start
I（）finish my homework now. I can do it at the weekend.A...
单项选择题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
People wandering in the fairground or park area（）wear a...
单项选择题People wandering in the fairground or park area（）wear a uniform.
A.must B.mustn‘t C.have to D.don‘t have to
Not until most of the people had left the airport（）his ...
单项选择题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
