单项选择题

All you can do now is ______.

A．wait
B．having to wait
C．waiting
D．having waited
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单项选择题
My parents used ______ in South America and I was used to the long distance flights between China and South America during the vacations.
A．live
B．living
C．to live
D．to living
单项选择题
She will tell you which file ______ out.
A．to be sorted
B．to sort
C．sort
D．sorting
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