问题补充：
—Can I help you，dear?
—Yeah,l don’t knowa 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：考察宾语从句。句意：亲爱的，我能为你做点什么？——是的，我不知道怎样做香蕉奶酪。也许你能教我。当特殊疑问词后接动词不定式可以充当动词宾语，故选C
