单项选择题

________is known to all, too much smoking will cause lung cancer.

A．That
B．It
C．As
D．What
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单项选择题
Do not trust such men________ often like to praise you to your face.
A．who
B．that
C．as
D．they
单项选择题
_________in a company, Miss Li will become a famous pop singer.
A．It is an employee that
B．She was an employee
C．An employee before
D．Once an employee
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