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