-- ______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(zhǎng)。句意：你的叔叔什么時(shí)候離開的他的家鄉(xiāng)？——他大概離開將近二十年了。Leave是瞬間動(dòng)詞，不能和表示一段時(shí)間的時(shí)間狀語(yǔ)連用，結(jié)合語(yǔ)境可知選B。
點(diǎn)評(píng)：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(guò)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�，F(xiàn)在完成時(shí)態(tài)中表示一段時(shí)間的時(shí)間狀語(yǔ)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(yǔ)連用，需注意區(qū)分。
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