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9．-Isn't it time you went to bed，Mike？
-I ________ painting all afternoon，so I have to finish my homework now．（　　）
A．was practicingB．have practiced
C．have been practicingD．had practiced

分析 --Mike，難道還不到去睡覺的時間嗎？
--我整個下午都在練習繪畫，所以現在我必須去寫作業(yè)了．

解答 答案：C．根據all afternoon可知練習繪畫持續(xù)了整個下午，而so I have to finish my homework now表明我現在要去做作業(yè)，強調一直在練習繪畫，所以用C現在完成進行時．

點評 考查現在完成時．現在完成進行時與現在完成時的比較：
  1．相同點：
    當表示過去發(fā)生且一直持續(xù)到現在的動作時，兩者通用；現在完成進行時只是現在完成時的一種強調時態(tài)而已．
如 I have played for half an hour since I began to play tennis．=I have been playing for half an hour since I began to play tennis．
    2．不同點：
   （1）當表示過去發(fā)生的動作，已經完成，強調對現在產生的結果或影響時，只能用現在完成時．如 I have copied these problems．
      （2）當使用現在完成進行時的時候，主句的謂v．要用延續(xù)性動詞；而當使用現在完成時的時候，是否使用延續(xù)性動詞，視具體情況而定．
    （3）不能用于進行時的動詞（如like，want等） 也不能用于現在完成進行時．而現在完成時無此限制．
如 I have been liking her for a long time．×
         I have liked her for a long time．√

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