英语选择题疑问1
I have been working there for 15 years,and never before _____my boss so serious.
A did I find B.have I found
请解释为何选B不选A,
人气：455 ℃ 时间：2020-03-20 18:08:18
解答
parallel tense:I have been --- i have found (first time ever after 15 years).A="did I find" is "past tense".
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