--- You didn’t tell your parents the date of our graduation ceremony, did you?
--- No, but I . My sister had told them.
A. didn’t need to
B. needn’t have
C. couldn’t have
D. shouldn’t
网友回答
(答案→)A. didn’t need to
B. needn’t have
C. couldn’t have
D. shouldn’t
解析：句意：上文，你没有告诉你的父母我们毕业典礼的日期，是吗？下文，没有，但是也没有必要，我的姐姐已经告诉他们了。didn’t need to没有必要告诉，实际也没告诉；needn’t have本不必要告诉，但实际告诉了；couldn’t have表示对过去某种情况的怀疑和不确定；shouldn’t不应该，选A。