选C,用助动词does代替,因为这句是一般现在时,而且it是第三人称单数,所以用does代替.至于前面为什么用save,而不用saves,因为be supposed to do ,意思是应该做某事,在to 后面必须用动词原形构成不定式.
this robot is supposed to save a lot of labor ,but it remain
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