this robot is supposed to save a lot of labor ,but it remain

this robot is supposed to save a lot of labor ,but it remain a problem if it ----
A IS B SAVES C DOES D HAS
为什么用原句用save 而不是saves呀
选什么呀

时差爱 1年前已收到2个回答举报

aigo924 幼苗

共回答了20个问题采纳率：80% 举报

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.

1年前

Maiar 幼苗

共回答了70个问题举报

虚拟语气的if 啊这里后面用原形的

1年前

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