the children are required to learn table manners,--very important at table.A.which isB.which areC.what areD.that is

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the children are required to learn table manners,--very important at table.A.which isB.which areC.what areD.that is
the children are required to learn table manners,--very important at table.
A.which isB.which areC.what areD.that is

the children are required to learn table manners,--very important at table.A.which isB.which areC.what areD.that is
B Which指代manners,该用复数

A