单选题They considered ______ a&

问题补充：

单选题Theyconsidered______acomputer,whichwasconsidered________agreathelpintheirwork.A.to buy; to beB.buying; beingC.to buy; beingD.buying; to be

答案：

D解析考查动词consider 的用法:考虑做某事 consider doing, 被认为 be considered to be ,根据题意应选D 。