单项选择题
He ______ quite a lot when he was young.
A．used to travel
B．used to traveling
C．was used to travel
D．would use to travel
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单项选择题
There must be a(n) ______ window somewhere--I can feel cold air coming in.
A．open
B．opened
C．opening
D．open-up
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单项选择题
Tom and Jack have returned but ______ students of the group haven't come back yet.
A．other
B．the others
C．others
D．another
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