TheBunsenBurnerissonamedbecauseit

发布时间：2020-07-11 06:26:38

The Bunsen Burner is so named because it is thought _________ by Robert Bunsen．













A.to be invented












B.having been invented











C.invented











D.to have been invented

网友回答

D解析本句考查动词的被动语态和时态，it+is+动词ed形式，to do是固定的搭配用法。而Bunsen Burner的发明是过去发生的动作，所以用完成时态。
以上问题属网友观点，不代表本站立场，仅供参考！