–CanIhelpyou,dear?–Yeah,Idon’tknow

问题详情：

 – Can I help you, dear?

– Yeah, I don’t know ______ a banana milk shake. Maybe you can teach me.

A. what to do     B. when to do     C. how to make     D. why to do

【回答】

C

知识点：非谓语动词

题型：选择题