The meeting has been canceled. Ann ______ all that work.

The meeting has been canceled. Ann ______ all that work.
A、need to do
B、need have
C、needn’t have done
D、needed not to do
【正确答案】：C
【题目解析】：needn't have done 主要表示某事已经做了，但后来觉得没必要去做。
句意：会议取消了。安不必做所有那些工作。