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(shí)候買的新相機(jī)？
---我買了兩個(gè)星期了．

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

點(diǎn)評(píng) 現(xiàn)在完成時(shí)的未完成用法只適用于延續(xù)性動(dòng)詞，不可用于終止性動(dòng)詞，即瞬間完成或延續(xù)時(shí)間很短的動(dòng)詞．如：come，go，arrive，leave，join，become，die等．

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