I sent an MP4 to Alice by mail just now.You___so.She is coming tomorrowA.needn't doB.needn't have doneC.musn't do D.musn't have done

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I sent an MP4 to Alice by mail just now.You___so.She is coming tomorrowA.needn't doB.needn't have doneC.musn't do D.musn't have done

I sent an MP4 to Alice by mail just now.You___so.She is coming tomorrowA.needn't doB.needn't have doneC.musn't do D.musn't have done
I sent an MP4 to Alice by mail just now.You___so.She is coming tomorrow
A.needn't do
B.needn't have done
C.musn't do
D.musn't have done

I sent an MP4 to Alice by mail just now.You___so.She is coming tomorrowA.needn't doB.needn't have doneC.musn't do D.musn't have done
B
needn't have done sth 表示过去没必要做什么,而事实上已经做了

B,不必这么做却已经做了