单项选择题

He entered the office hurriedly, ______ the door open.

A．leave
B．leaving
C．to leave
D．left
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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
单项选择题
So little ______ about mathematics that the lecture was completely beyond me.
A．I know
B．I knew
C．did I know
D．do I know
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