Never before buying a computer but now it seems a necessity in my everyday life.A. did I

问题补充：

Never before buying a computer, but now it seems a necessity in my everyday life.

A. did I think of

B. have I thought of

C. I thought of

D. I have thought of

答案：

A. did I think of

(答案→)B. have I thought of

C. I thought of

D. I have thought of

解析：考查部分倒装。Never是表否定意义的词，放在句首时，句子谓语要部分倒装，排除C,D；根据never和before,可知句子应该用现在完成时态，所以选B。