【题目】The inventor is satisfied to see a number of new products _____ after countless efforts.
A.developB.developedC.developingD.to develop
在线课程【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。
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