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
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单项选择题
You must remember ______ this book to the library tomorrow.
A．having returning
B．return
C．to return
D．to returning
单项选择题
Where are you I ______ for you here for ages!
A．waited
B．was waiting
C．had waited
D．have been waiting
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