单项选择题

I noticed the professor ______ in and ______ down.

A． walk... sit
B． to walk... sit
C． to walk... to sit
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单项选择题
She has three brothers. One is in Beijing, but ______ are in Shanghai.
A． the others
B． anothers
C． others
单项选择题
She looked on him ______ a very great professor.
A． for
B． to
C． as
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