问题
选择题
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
答案
答案：B
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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
答案：B