单项选择题

He ______ smoking at last.

A．gave up
B．gave out
C．gave in
D．gave off
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单项选择题
He entered the office hurriedly, ______ the door open.
A．leave
B．leaving
C．to leave
D．left
单项选择题
______ are afraid of difficulties; we are all determined.
A．None of us
B．Not all of us
C．All of us
D．All of us not
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