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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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,

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,
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,

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,
parallel tense:I have been --- i have found (first time ever after 15 years).A="did I find" is "past tense".

和楼上答案一样,主要是看时态一致.
1.简单句:当句子中有两个或两个以上的谓语动词共用同一个主语时,一般谓语动词的时态要求保持一致。
2.并列句:由并列连接词(有时可能省略掉连接词)连接的两个句子也要求时态上的一致,这类连接词有and,as well as等。...

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和楼上答案一样,主要是看时态一致.
1.简单句:当句子中有两个或两个以上的谓语动词共用同一个主语时,一般谓语动词的时态要求保持一致。
2.并列句:由并列连接词(有时可能省略掉连接词)连接的两个句子也要求时态上的一致,这类连接词有and,as well as等。

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