He has been        the computer for two hours, chatting with a boy from Australia.
A．inB．onC．a(chǎn)tD．by
C               
             
試題分析：考查固定搭配。句意 他呆在電腦旁兩個小時了，與一個來自澳大利亞的男孩聊天。Be at the computer 在電腦上，表示狀態(tài)，后面有for two hours，所以選C項。          
考點 : 考查固定搭配
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