The sheep ----farmed for meat by theold man,which is said to ----by a scientist yesterday.A is;be bought B are;be bought C is;have been bought D are have been bought为什么选C

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Thesheep----farmedformeatbytheoldman,whichissaidto----byascientistyesterday.Ais;beboughtBare;bebough

The sheep ----farmed for meat by theold man,which is said to ----by a scientist yesterday.A is;be bought B are;be bought C is;have been bought D are have been bought为什么选C
The sheep ----farmed for meat by theold man,which is said to ----by a scientist yesterday.
A is;be bought B are;be bought C is;have been bought
D are have been bought
为什么选C

The sheep ----farmed for meat by theold man,which is said to ----by a scientist yesterday.A is;be bought B are;be bought C is;have been bought D are have been bought为什么选C
那个老头养的用来吃肉的那头羊,据说昨天被一个科学家买去了.
因为,which is 用的是单数,判断前者用单数.
因为已经被买走了,所以用了不定式的完成式

后面用单数,所以前面只好用IS
而且是昨天就被带走,所以用完成时