题目内容

---_____ did your uncle leave his hometown?
---He ________ for nearly twenty years.
A.When; has leftB.When; has been away
C.How long; has left D.How long; has been away
B
第一空,因为后面给的动词是短暂性动词,所以用特殊疑问词when ,因为how long 与延续性动词连用,而后一个空,后接for+一段时间,所以特殊疑问词需要是延续性的,故选B
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