问题标题：
帮忙分析个英语单选题Bythen,thefloodthathadhappenedinBishancountryofChongqing___totheinnercity,makingitbecomeanisolatedisland.AhasBhadbeenspreadChasspreadDhasbeenspread并且分析下时态,
问题描述：
帮忙分析个英语单选题
Bythen,thefloodthathadhappenedinBishancountryofChongqing___totheinnercity,makingitbecomeanisolated
island.
AhasBhadbeenspreadChasspreadDhasbeenspread
并且分析下时态,
葛建华回答：
B,bythen到×时候为止,后面有hadhappened,过去完成,保持时态一致,过去完成时,had^beenspread,been这里不是被动哦
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