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now there are already robots working in factories .为什么用worki

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now there are already robots working in factories .为什么用working 而不是work
now there are already robots working in factories .为什么用worki
因为前面已经有are和now代表它的时态为现在进行时,故使用working而不是work
再问: 那today there are already robots working in factories 呢?
再答: 同理,today也是用于现在进行时货或一般现在时,但后面有了are,所以为进行时