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
I really don`t know_____ A.what to do it B.how to do C.what to do D.how I do
I really don`t know_____ A.what to do it B.how to do C.what to do D.how I do
其他人气：548 ℃时间：2019-10-29 12:27:46
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