– When are you leaving for the concert?--I’m not sure. I haven’t finished the dishes.A.

问题补充：

– When are you leaving for the concert?

--I’m not sure. I haven’t finished the dishes.

A. do

B. to do

C. doing

D. done

答案：

A. do

B. to do

(答案→)C. doing

D. done

解析：在英文中表示完成做某事可用finish doing sth，故本题选C。