You have followed the speaker’s argument very well, but there appears a point you are not clear about. Which of the following expressions do you think is INAPPROPRIATE to help you in the situation?

A.I’d need to think about that since I couldn’t understand.

B.Excuse me, I would like to ask you something about ….

C.Excuse me, I was wondering whether I could ask ....

D.Sorry to interrupt you, may I ask a question about ….

正确答案：I’d need to think about that since I couldn’t understand.