Dangerous and hard work will be _____by robots.用do的适当形式填空

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Dangerous and hard work will be _____by robots.用do的适当形式填空
Dangerous and hard work will be _____by robots.用do的适当形式填空

Dangerous and hard work will be _____by robots.用do的适当形式填空
done
be + 过去分词 构成被动语态