单项选择题

Don't forget ______the window before leaving the room.

A．to have closed
B．to close
C．having closed
D．closing
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单项选择题
It is ______for a person in his position to make such a mistake.
A．rare
B．less
C．little
D．few
单项选择题
He has been teaching for 2 years, but being a teacher is not his ______.
A．chance
B．character
C．attitude
D．choice
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