Mr white_______in this school for20 years before he moved to London
A has taught B taught C had taught
解释为什么选这个选项
人气：483 ℃ 时间：2020-03-23 17:47:11
解答
C
后面的 before he moved to London为过去时,而Mr white_______in this school for20 years 发生在后面的 before he moved to London前,故用过去完成
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