--- Excuse me sir. Would you do me a favor? --- Of course. What is it? --- I if you coul

问题补充：

--- Excuse me, sir. Would you do me a favor?

--- Of course. What is it?

--- I if you could tell me how to fill out this form.

A. had wondered

B. was wondering

C. would wonder

D. did wonder

答案：

A. had wondered

(答案→)B. was wondering

C. would wonder

D. did wonder

解析：考查时态：句意是;--对不起，先生，你能帮我个忙吗?—当然。是什么？--我想知道你能不能告诉我怎么填这个表格。选B。