I don't know what _____.A.do B.doing C.did D.to do
问题描述:
I don't know what _____.A.do B.doing C.did D.to do
答
D 动词不定式
答
D
what 引导了一个宾语从句
to do 是不定式
其实这种结构很多的,多多锻炼语感吧