问题补充：
—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 make
C. how to make
D. why to do
答案：
A. what to do
B. when to make
(答案→)C. how to make
D. why to do
解析：英语宾语从句中一般为陈述语序。句意：我能帮助你吗？亲爱的。——是的，我不知道如何做香蕉奶昔，可能你能够教我。what to do做什么；when to make何时做；how to make怎样做；why to do为何做。故选C。
