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what they have done __useful to the people

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what they have done __useful to the people
A are considered B is considered C were considered D will be considered
选哪个`为什么.
what they have done __useful to the people
选b.consider sth.+形容词,"认为某事怎样怎样"如
I consider him dishonest 我认为他不诚实.
变成被动语态就是:He is considered dishonest.
这句的意思是:他们的行为被认为是对人民有用的.
what they have done 是主语从句,当作第三人称,所以要用is considered.
D 是将来时态,有时也可以用