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    精英家教网 > 高中英语 > 题目详情
    I don’t know _____ he will be back home.        
    A. who
    		B. what
    		C. when
    		D. where
    C
    这题考查宾语从句连接词的选用，因为是I don’t know，所以用疑问词，因为有主谓宾，所以选疑问副词，地点是home，因此选C。句意是：我不知道他什么时候回来。选C。
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