Some farmers are still using tools and methods ___ back to hundreds of years ago.A.dated B.to date C.dating D.to be datedWhy C not

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Somefarmersarestillusingtoolsandmethods___backtohundredsofyearsago.A.datedB.todateC.datingD.tobedate

Some farmers are still using tools and methods ___ back to hundreds of years ago.A.dated B.to date C.dating D.to be datedWhy C not
Some farmers are still using tools and methods ___ back to hundreds of years ago.
A.dated B.to date C.dating D.to be dated
Why C not

Some farmers are still using tools and methods ___ back to hundreds of years ago.A.dated B.to date C.dating D.to be datedWhy C not
C,date back to常用主动语态,不用被动语态.
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