问题
选择题
I want to know ________ next.
A. what to do it B. how to do C. what to do
答案
答案：C
题目分析：what可充当宾语，故不定式后不可再加宾语，所以A.what to do it 错误，去掉it就对了，故选C。而B选项中how是副词，不可充当宾语，故不定式后应补宾语it。考点：
点评：类似的结构还有：where to go, when to do sth.