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—________did your uncle leave his hometown?—He________for ne

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—________did your uncle leave his hometown?—He________for nearly twenty years.A.When; has left
—________did your uncle leave his hometown?
—He________for nearly twenty years.
A.When; has left B.When; has been away
C How long; has left D.How long; has been away
我看好多答案第一个空都选“when”,我觉得应该是“haw long”,说明理由
—________did your uncle leave his hometown?—He________for ne
如果用how long 这句应该这样说How long has your your uncle left his ...
而本体—________did your uncle leave his hometown是 过去式所以when .在现在完成时中leave与时间段连用要换成be away ,所以本体B正确