Little has been done___is helpful to our work?A.what B.which C.that D.all that

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Littlehasbeendone___ishelpfultoourwork?A.whatB.whichC.thatD.allthatLittlehasbeendone___ishelpfultoou

Little has been done___is helpful to our work?A.what B.which C.that D.all that
Little has been done___is helpful to our work?
A.what B.which C.that D.all that

Little has been done___is helpful to our work?A.what B.which C.that D.all that
B,要解释么?