单项选择题

I am not very good （） maths. Would you please work out the total cost of our trip？

A. in
B. for
C. on
D. at

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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

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

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