—Excuse me sir. Would you do me a favour?—Sure. What is it?—I if you could tell me how to

问题补充：

—Excuse me, sir. Would you do me a favour?

—Sure. What is it?

—I if you could tell me how to pronounce this English word.

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：指“我”在说“请帮个忙好吗?”的时候，“我在想……”，所以用过去进行时。