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Peter couldn't conce

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Peter couldn't conce
Peter couldn't concentrate____ what he was doing while his family were watching TV.      [     ]
A.on          
B.to          
C.in          
D.for
Peter couldn't conce
A
peter was too tired that he couldn't continue runing ①peter couldn't see any words on the blackboard,( There was a large box behind the door and Peter couldn't ___ peter ___________to escape from the prison,but he couldn't f Peter couldn't have____his exam paper before he handed it in Peter was _____ tried that he couldn't continue running.A.ve I couldn`t help couldn't是什么意思 couldn\'t find\'.txt\' i couldn‘t是什么意思 things couldn't be couldn't have done?