It was very kind of you to clean the office,though youA.needn't do B.wouldn't haveC.didn't have to D.mustn't have done为什么选C

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Itwasverykindofyoutocleantheoffice,thoughyouA.needn''tdoB.wouldn''thaveC.didn''thavetoD.mustn''thavedone

It was very kind of you to clean the office,though youA.needn't do B.wouldn't haveC.didn't have to D.mustn't have done为什么选C
It was very kind of you to clean the office,though you
A.needn't do B.wouldn't have
C.didn't have to D.mustn't have done
为什么选C

It was very kind of you to clean the office,though youA.needn't do B.wouldn't haveC.didn't have to D.mustn't have done为什么选C
C..
你打扫教室真是太好了,虽然你不需要这么做..
have to...不得不..
前面用was,过去时,所以后面用过去时..

C
你是不用做清洁的,a是不用做但还没做,c是不用做但做了