Robots,______ (become) increasingly prevalent in factories and industrial plants throughout the developed world, are programmed and engineered to perform industrial tasks without human intervention.
【正确答案】：becoming
【题目解析】：句子后面出现了谓语动词are programmed,说明空格该填的是非谓语动词，robots和become之间是主动关系，所以用动词ing形式。
