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﹣The light in his room is still on.Do you know    ?﹣Maybe at midnight again.(  )A.if he is busy stu...

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must study  must be studying  must have studied  would study  
must    can’t    can    might  
has turned   turned off   turned on    Has turned off  
put up, put out    put out, put on    put in, put up    put in, put on  
has he  hasn’t he  must he  mustn’t he  
must    can’t    can    might  
across    through    over    upon  
why he stays up so late    if he works hard    what he is doing    when he will stop working  
has turned on    turned off    turned on    has turned off  
in, in    on, on    in, on    on, in  
if he works hard    who he is studying with    what he is busy with    when he will stop working  
if he works hard   why he stays up so late   why is he so busy   when he will stop working  
if he works hard    who he is studying with    what he is busy with    when he will stop working  
burnt      burning    burn      to burn  
put up, put out    put out, put on    put in, put up    put in, put on  
if he works hard    why he stays up so late    why is he so busy    when he will stop working  

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