问题描述：
18.Mr Turner taught English in a middle school _______ 1998.为什么选in?不是since
18.Mr Turner taught English in a middle school _______ 1998.A.for B.at C.in Dsince 为什么选in?
18.Mr Turner taught English in a middle school _______ 1998.A.for B.at C.in Dsince 为什么选in?
问题解答：
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