题目内容
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 |
B
略
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| A.mustn’t have done | B.needn’t have done |
| C.didn’t need to do | D.can’t have done |