He______on the farm for twenty years and now he is a teacher.
A.has workedB.had workedC.workedD.works
C

試題分析:現(xiàn)在完成時(shí)表示發(fā)生在過(guò)去的動(dòng)作對(duì)現(xiàn)在有影響的的事情,而這邊對(duì)現(xiàn)在已經(jīng)沒(méi)有影響了,因?yàn)楝F(xiàn)在是一名老師,所以不用現(xiàn)在完成時(shí);過(guò)去完成時(shí)表示過(guò)去的過(guò)去,這里沒(méi)有過(guò)去的動(dòng)作作為參照的動(dòng)作,故不用過(guò)去完成時(shí);又根據(jù)he is a teacher,他現(xiàn)在是老師,故選C。
點(diǎn)評(píng):本題難度適中。動(dòng)詞時(shí)態(tài)的考查與一定的語(yǔ)境結(jié)合一起增加了試題的難度,有的考生時(shí)態(tài)的用法背的很熟,但在不同的語(yǔ)境下,就做不對(duì)了,提醒考生一定要會(huì)分析理解語(yǔ)境。
即學(xué)即練:——You look pale,what troubled you? —I ________ my dead friend. 
A.am thinking about     B.was thinking about C.had thought about     D.will think about 
解析:B。句意:--你的臉色蒼白什么事?--我剛才在想我的去世的朋友。
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