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I got up early this morning, but I so because I was not on duty today. A. mustn’

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I got up early this morning, but I so because I was not on duty today. A. mustn’

 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

试题答案

B