You’re quite free now I think.---. I have tons of things to do!A. By accident B. On

问题补充：

--- You’re quite free now, I think.

---. I have tons of things to do!

A. By accident

B. On the contrary

C. That’s right

D. I can’t agree more

答案：

A. By accident

(答案→)B. On the contrary

C. That’s right

D. I can’t agree more

解析：句意：--我认为你现在一点都不忙。--相反，我有许多事情要做。By accident偶然，意外地；On the contrary相反；That’s right对的；I can’t agree more我非常同意。根据句意故选B。