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一道英语语法题,It was very kind of you to do the washing-up,but you

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一道英语语法题,
It was very kind of you to do the washing-up,but you __________ it.
【正确答案】
D
A) mustn’t have done
B) wouldn’t have done
C) mightn’t have done
D) didn’t have to do
搞不懂原因,求详解,
一道英语语法题,It was very kind of you to do the washing-up,but you
have to do 必须做...
need to do 需要做...
don't have to do 和 don't need to do 表示 “做...是不必要的”,属于固定用法
从前面的was看出是过去时态,所以后面用 didn't