8．-Isn't it hard to drive downtown to work？
-Yes，that's why I ____ to work by train．（　�。�
A．have been goingB．have goneC．was goingD．will have gone

分析 句意：-難道開車去市中心上班很難嗎？-是的，這就是我為什么一直乘火車上班的原因．

解答 答案A．"have been doing"表示過去發(fā)生的動(dòng)作一直持續(xù)到現(xiàn)在，可能剛剛結(jié)束也可能繼續(xù)進(jìn)行下去；"have done"表示過去發(fā)生的動(dòng)作對(duì)現(xiàn)在的影響；"was/were doing"表示過去的某個(gè)時(shí)間點(diǎn)或時(shí)間段正在做某事；"will have done"對(duì)于將來的某個(gè)時(shí)間點(diǎn)來說將會(huì)完成某事．根據(jù)句意，：-難道開車去市中心上班很難嗎？-是的，這就是我為什么一直乘火車上班的原因．說明說話人從過去到現(xiàn)在一直在乘火車，而且還要繼續(xù)乘下去．用現(xiàn)在完成進(jìn)行時(shí)，故選A．

點(diǎn)評(píng) 本題考查現(xiàn)在完成進(jìn)行時(shí)，考查時(shí)態(tài)時(shí)，如果有時(shí)間狀語，就充分利用時(shí)間狀語，如果沒有，要結(jié)合上下文找出來

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