题目
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,
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,
提问时间：2020-11-03
答案
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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