如题所述
The robot has been working in the factory.
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第1个回答 2012-02-20
Already robots working in factories
第2个回答 2012-02-20
Roborts are already working in the factory.
第3个回答 2012-02-20
There has been robots working in factories.
第4个回答 2012-02-20
There was robots working in the factory