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He has been        the computer for two hours, chatting with a boy from Australia.
A.inB.onC.atD.by
C               
             
试题分析:考查固定搭配。句意 他呆在电脑旁两个小时了,与一个来自澳大利亚的男孩聊天。Be at the computer 在电脑上,表示状态,后面有for two hours,所以选C项。          
考点 : 考查固定搭配
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