—Excuse me could you help me take this chair to my office?—I’m sorry I can’t help you r

问题补充：

—Excuse me, could you help me take this chair to my office?

—I’m sorry, I can’t help you right now. I’m too busy.

A. and

B. but

C. so

D. because

答案：

A. and

(答案→)B. but

C. so

D. because

解析：I’m sorry,but…习惯表达，用于表达委婉的拒绝。句意：对不起，我现在不能帮你，我很忙。故选B.