1．He works in a factory now，but he _______ on a farm for 20years．（　　）
A．workedB．has worked
C．had workedD．had been working

分析 他在一家工廠工作，但他在農(nóng)場(chǎng)工作了20年了．

解答 答案是A．根據(jù)句意可知，他現(xiàn)在在工廠工作，言外之意 在農(nóng)場(chǎng)工作20年是過(guò)去發(fā)生的事情，所以后面用一般過(guò)去式．需要注意的是，這題容易誤選C，C 是過(guò)去完成時(shí)，是過(guò)去的過(guò)去，但在題中無(wú)法找到一個(gè)過(guò)去式，且在農(nóng)場(chǎng)工作發(fā)生在這個(gè)過(guò)去式之前．并不是見(jiàn)到for就一定要用完成時(shí)，只有強(qiáng)調(diào)從過(guò)去一直持續(xù)到現(xiàn)在，有可能持續(xù)到將來(lái)，或者對(duì)現(xiàn)在有影響時(shí)用完成時(shí)．故答案為A

點(diǎn)評(píng) 高考題目對(duì)時(shí)態(tài)的考查是重點(diǎn)，謂語(yǔ)動(dòng)詞要與時(shí)間狀語(yǔ)保持一致，時(shí)態(tài)與時(shí)間是密不可分的，各種時(shí)態(tài)卻要受到時(shí)間和語(yǔ)言環(huán)境的限制，根據(jù)題干提供的時(shí)間或者時(shí)間狀語(yǔ)體現(xiàn)的時(shí)間來(lái)判斷句子的時(shí)態(tài)是最直接的解題方法，扎實(shí)的語(yǔ)法功底加上準(zhǔn)確的理解至關(guān)重要．

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