9．-Ming ming，you _______TV for three hours．You should have a rest．
-OK．Mum．（　�。�
A．have watchedB．are watchingC．watches

分析 ---明明，你已經(jīng)看電視三個小時了．你應該休息一下了．---好的，媽媽．

解答 答案：A．根據(jù)"you _______TV for three hours"中的"for three hours"可知看電視這個動作從過去一直到現(xiàn)在有三個小時了，與現(xiàn)在有關，表動作從過去延續(xù)到現(xiàn)在，要用現(xiàn)在完成時，現(xiàn)在完成時的構成：主語+have或has+動詞過去分詞，故選A．

點評 本題考查現(xiàn)在完成時，掌握現(xiàn)在完成時的意義，構成，根據(jù)關鍵詞確定時態(tài)．

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