—Thank you very much for helping me when I was in trouble.

— _____.  [ ]

A. Don't mention it

B. With pleasure

C. That's right  

D. You said it

假如你叫Liu Mei，你的好朋友Mary邀请你去参加她的生日晚会。可是你的妈妈病了，她要去看医生。你必须在家照顾弟弟。英语要考试了，晚上你要在家学习。因此，你太忙，不能去。请你给她写一封信，告诉她你为什么不能去，并祝她生日快乐。（开头与结尾已给出）

Dear Mary,

Thank you for _______________________________________________________________________________

_______________________________________________________________________________

_______________________________________________________________________________

_______________________________________________________________________________

_______________________________________________________________________________

_______________________________________________________________________________

Write soon．

Yours，

Liu Mei