英语选择题疑问1I 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,
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题目内容：
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,
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