17．一I wonder when you_____the new camera．
一Well，I____it for two weeks．（　�。�
A．have bought； have hadB．bought； have bought
C．bought； have hadD．have bought； have bought

分析 ---我想知道你什么時候買的新相機？
---我買了兩個星期了．

解答 答案：C．
上文when引導的賓語從句，主句是一般現(xiàn)在時，從句時態(tài)不受限制，詢問過去的事情用一般過去時，buy的過去式bought．下文動作發(fā)生在過去，持續(xù)了一段時間用現(xiàn)在完成時have/has+過去分詞，buy是短暫性動詞，不能與一段時間for+two weeks連用，故換成have，have的過去分詞had，主語I，故have had，故答案是C．

點評 現(xiàn)在完成時的未完成用法只適用于延續(xù)性動詞，不可用于終止性動詞，即瞬間完成或延續(xù)時間很短的動詞．如：come，go，arrive，leave，join，become，die等．

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