单项选择题

______ at the door before you come into the room.

A．Hit
B．Knock
C．Touch
D．Strike
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单项选择题
We tried to ______ the nervous old lady that flying was safe.
A．secure
B．ensure
C．assure
D．certify
单项选择题
______ anything about the accident, he went to work as well.
A．Not know
B．Know not
C．Knowing not
D．Not knowing
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