I don't know______________ at the weekend

问题描述:

I don't know______________ at the weekend
A.what to do B.how to do C.what will I do
请问选哪个?

A
what to do是表示做什么,句子后面要加内容,而在这里,what就是内容!
如果选B:how to do 那么句子后面就没有内容了.
如果选D,应该用陈述句语序来回答