20. I got up early this morning, but I ________ so because I was not on duty today.
A.mustn’t have done | B.needn’t have done |
C.didn’t need to do | D.can’t have done |
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20. I got up early this morning, but I ________ so because I was not on duty today.
A.mustn’t have done | B.needn’t have done |
C.didn’t need to do | D.can’t have done |