—________did your uncle leave his hometown?
—He ________ for nearly twenty years.
A．When; has leftB．When; has been away
C．How long; has leftD．How long; has been away
B

試題分析：when什么時(shí)候；how long多長；根據(jù)下文時(shí)間狀語，將近二十年了�？芍衔奶釂柕氖菚r(shí)間長短，下文描述的是從過去某時(shí)持續(xù)到現(xiàn)在的狀態(tài)，故謂語動(dòng)詞用持續(xù)性動(dòng)詞，故選B。
點(diǎn)評：完成時(shí)態(tài)中的動(dòng)詞有瞬間動(dòng)詞和持續(xù)性動(dòng)詞之分，瞬間動(dòng)詞的過去分詞強(qiáng)調(diào)的是動(dòng)作的完成，持續(xù)性動(dòng)詞強(qiáng)調(diào)的是動(dòng)作的持續(xù)性。現(xiàn)在完成時(shí)態(tài)中表示一段時(shí)間的時(shí)間狀語不能和瞬間動(dòng)詞連用，持續(xù)性動(dòng)詞不能和表示瞬間時(shí)間的時(shí)間狀語連用，需注意區(qū)分。
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