12.Tina __________ as a physics teacher for over twenty years.(  )
A.has workedB.workedC.workingD.works

分析 Tina作為一名物理老師,已經(jīng)工作了20多年了.

解答 答案:A 現(xiàn)在完成時(shí)基本用法之一:表示過(guò)去已經(jīng)開(kāi)始,持續(xù)到現(xiàn)在,而且還可能繼續(xù)下去的動(dòng)作或狀態(tài),常與since或for引導(dǎo)的時(shí)間狀語(yǔ)連用.根據(jù)for over twenty years.可知Tina作為物理老師已經(jīng)20年了,并很可能會(huì)持續(xù)下去,應(yīng)該用現(xiàn)在完成時(shí)態(tài).現(xiàn)在完成時(shí)態(tài)的構(gòu)成:助動(dòng)詞have/has+過(guò)去分詞,根據(jù)主語(yǔ)Tina,是第三人單數(shù),所以應(yīng)該用has,故選:A.

點(diǎn)評(píng) 本題主要考查動(dòng)詞時(shí)態(tài),做此類題目要注意時(shí)間狀語(yǔ),注意句子所表達(dá)的含義,才能更好地判斷.同時(shí)更應(yīng)記清時(shí)態(tài)的構(gòu)成形式.就本題而言,主要考查現(xiàn)在完成時(shí)態(tài).

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