题目内容

Now there are already robots _________ in factories.
A．workingB．to workC．workD．worked
A
考查非谓语动词。句意：现在已经有机器人在工厂工作了。现在分词作定语表示正在进行的伴随性动作，和被修饰词是主谓关系。故选A。。
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