第9题: [单项选择]Never before ______made so great achievements in developing new technology of communication. A. we have B. did we C. have we D. do we 参考答案:C 答案解析:[考查点] 倒装
[句意] 我们此前从未在新通信科技的研发方面取得如此巨大的成就。
[解析] 某些具有否定意义的副词(如never,seldom,scarcely,little,few,no