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

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单项选择题

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

单项选择题

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

单项选择题

A.has taken
B.has been taking
C.is taken
D.has been taken