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(shí)間嗎？
--我整個(gè)下午都在練習(xí)繪畫，所以現(xiàn)在我必須去寫作業(yè)了．

解答 答案：C．根據(jù)all afternoon可知練習(xí)繪畫持續(xù)了整個(gè)下午，而so I have to finish my homework now表明我現(xiàn)在要去做作業(yè)，強(qiáng)調(diào)一直在練習(xí)繪畫，所以用C現(xiàn)在完成進(jìn)行時(shí)．

點(diǎn)評(píng) 考查現(xiàn)在完成時(shí)．現(xiàn)在完成進(jìn)行時(shí)與現(xiàn)在完成時(shí)的比較：
  1．相同點(diǎn)：
    當(dāng)表示過(guò)去發(fā)生且一直持續(xù)到現(xiàn)在的動(dòng)作時(shí)，兩者通用；現(xiàn)在完成進(jìn)行時(shí)只是現(xiàn)在完成時(shí)的一種強(qiáng)調(diào)時(shí)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(diǎn)：
   （1）當(dāng)表示過(guò)去發(fā)生的動(dòng)作，已經(jīng)完成，強(qiáng)調(diào)對(duì)現(xiàn)在產(chǎn)生的結(jié)果或影響時(shí)，只能用現(xiàn)在完成時(shí)．如 I have copied these problems．
      （2）當(dāng)使用現(xiàn)在完成進(jìn)行時(shí)的時(shí)候，主句的謂v．要用延續(xù)性動(dòng)詞；而當(dāng)使用現(xiàn)在完成時(shí)的時(shí)候，是否使用延續(xù)性動(dòng)詞，視具體情況而定．
    （3）不能用于進(jìn)行時(shí)的動(dòng)詞（如like，want等） 也不能用于現(xiàn)在完成進(jìn)行時(shí)．而現(xiàn)在完成時(shí)無(wú)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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