单项选择题

When I entered the room, I saw him （） in a front seat staring at a picture in a strange way.

A. to sit
B. is sitting
C. sat
D. sitting

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单项选择题

Could you please tell me where（）find Professor Smith His wife has just called his office.

A. I can
B. can I
C. would I
D. I would

单项选择题

We definitely are not the perfect couple, （） we don’t pretend to be so.

A. and
B. or
C. for
D. because

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