--How long have you been in the school?--By the end of 2012,

--How long have you been in the school?--By the end of 2012,i _English for exactly 30 years and
i __in 5years.
A.willl have taught;will retire
B.have been teaching; am to retire
但我想不通a 不是挺对的么

falcon2k 1年前已收到1个回答举报

shouma007 幼苗

共回答了22个问题采纳率：95.5% 举报

By the end of 2012,i _English for exactly 30 years and i __in 5years.
by开头,表示“到……（某时间）”且其间一直持续,所以用been teaching表示延续性状态
am to retire则表示到某时间注定会发生的事件
,A其实口语中可能这么用,但这种考察严格语法的单选题要选出最适当的答案

1年前

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