27.The craft of thatching,the oldest of all the building cra

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27.The craft of thatching,the oldest of all the building crafts,as it ____ today ____ very little since the Middle Age.
A.are practised,have changed B.is practised,has changed
C.practises,changed D.practises,is changed
该题选什么呢?
为什么?
最好能翻译一下

B
原因：it后面肯定是第三人称单数,所以排除A；practise在这里要用被动语态,所以排除CD；与since搭配,表示“自中世纪以来”应该用现在完成时,所以选B.
译文：当今建造茅草屋的工艺——所有建筑工艺中最为古老的工艺,自中世纪起几乎没有改变过.

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