Never before ________ buying a computer, but now it seems a necessity in my ever

题型：不详难度：来源：

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

B

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。