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
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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
A．moreB．fewerC．strongerD．thinner
A．more
B．fewer
C．stronger
D．thinner
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