【语言素材】电话英语之听不懂怎么办

Ask for Clarification (and possible responses)

I'm sorry. I missed that. What did you just say? ==> Oh, let me explain.
Excuse me. I didn't catch what you said . Could you say that again please?==> I'd be happy to.
Sorry. I'm not sure I understand. What does that mean?==> Certainly,what I mean is…