Question

【题目】The inventor is satisfied to see a number of new products _____ after countless efforts.

A.developB.developedC.developingD.to develop

Answer 1

【答案】B

【解析】

考查非谓语动词。句意：经过无数的努力，发明家很满意地看到许多新产品被开发出来。此处products和develop之间是一种被动关系，用过去分词作宾语补足语，故选B。