单项选择题

Seeing is ______.

A. to believe
B. believing
C. believe
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单项选择题
The professor entered the office, ______ by a few of his students.
A. followed
B. following
C. follow
单项选择题
______ his address, I can’t send the letter to him.
A. Not to know
B. Not knowing
C. Not know
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