Everything _____ has been doneA.which we must doB.all that can be doneC.can be doneD.that can be done选哪个?为什么?

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Everything _____ has been doneA.which we must doB.all that can be doneC.can be doneD.that can be done选哪个?为什么?

Everything _____ has been doneA.which we must doB.all that can be doneC.can be doneD.that can be done选哪个?为什么?
Everything _____ has been done
A.which we must do
B.all that can be done
C.can be done
D.that can be done
选哪个?为什么?

Everything _____ has been doneA.which we must doB.all that can be doneC.can be doneD.that can be done选哪个?为什么?
D
that引导的定语从句,everything做先行词时,关系词只用that.

c

哎,忘记了啊......汗!