I really don`t know_____ A.what to do it B.how to do C.what to do_其他解答

I really don`t know_____ A.what to do it B.how to do C.what to do D.how I do

人气：323 ℃　时间：2019-10-29 12:27:46

解答

C
do在这里是及物动词.所以要有宾语.在这里宾语提前了,是what.
考察的是宾语从句