三,1.I do not know ( )he will be back home.A,who B what C whe

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三,1.I do not know ( )he will be back home.A,who B what C when Dwhere

这里选C,
know后面为宾语从句,when引导的宾语从句,when在句中不起成分.
首先从句中he为主语,will be为系动词,back home为表语.主系表都全着呢,不缺成分.故who,what不能选（都在从句中成分充当成分）从where与when之间选择
因为该句翻译为：我不知道他啥时候能回家.故可知这里的关系副词只能选when.表示他何时能回
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