--Comeputers are so useful.They can do almost everything!--Yes.But they ___ what to doA must be told B has to be known

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--Comeputers are so useful.They can do almost everything!--Yes.But they ___ what to doA must be told B has to be known
told后面：该做什么
told后面是从句 ,what to do是一个宾语从句,作宾语.同时还是一个简单句,全写为what should/can it do.
tell sb to do sth告诉某人做某事
计算机是非常有用的,他们几乎可以作任何事情．没错,但是他们必须接受指令,应该怎么做才行．

A为它们必须被告知做什么事情，B为他们必须被知道做什么事情。第二种说法是没有的，逻辑推理。选A

电脑必须接受指令才能工作.must be told what to do的意思是必须被告知做什么,符合这个情况,所以应选A
而has to be know则仅语态不符,

选A
1.tell 加双宾，所以被动以后，后面还有宾语。而know加单宾，语法不符合。
2.they是第三人称复数形式，而has是第三人称单数形式，语法不符合。

--Comeputers are so useful.They can do almost everything!--Yes.But they ___ what to doA must be told B has to be known --Comeputers are so useful.They can do almost everything!--Yes.But they ___ what to do--Comeputers are so useful.They can do almost everything!--Yes.But they ___ what to doA must be told B has to be known C．has to be known D．will know --Comeputers are so useful.They can do almost everything!--Yes.But they ___ what to doA must be told B will tell C has to be known D will know 没理解题. comeputers are very useful in our lives,()they?A isn't B wasn't C doesn't D aren't You Are so you are so sweet you are so sweet you are so beautiful you are so sweet . you are so dead flowers are so beautiful you are so why are you so why are you so You are so each you are so why are you so you are so beautiful