D
how long在此是用来对动作所持续的时间长度提问,即询问的是时间段,“since+（过去的）具体时间”就是表达这个概念.
10.“How long have you been here?” “_______ the end of last month.”
10.“How long have you been here?” “_______ the end of last month.”
A.In B.ByC.At D.Since
A.In B.ByC.At D.Since
英语人气：408 ℃时间：2019-10-19 21:09:15
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