17.-When did you buy the computer?
-I have ______ this computer for 5years,but it still works well.( 。
A.boughtB.haveC.had

分析 --你什么時(shí)間買(mǎi)的這臺(tái)電腦?
--我已經(jīng)買(mǎi)了5年了,但是它的性能仍然良好.

解答 答案C  buy意為"買(mǎi)",是非延續(xù)動(dòng)詞,不能和一段時(shí)間連用.have意為"擁有",是延續(xù)性單詞,可以和一段時(shí)間連用.根據(jù)時(shí)間狀語(yǔ)"for 5years"說(shuō)明電腦是五年前買(mǎi)的,一直到現(xiàn)在還擁有這臺(tái)電腦,所以要用現(xiàn)在完成時(shí),所以要用have的過(guò)去分詞had.故選C.

點(diǎn)評(píng) 首先要掌握哪些動(dòng)詞是延續(xù)性單詞,哪些動(dòng)詞是非延續(xù)動(dòng)詞,再結(jié)合時(shí)間狀語(yǔ),選擇相應(yīng)的動(dòng)詞.

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