问题补充:
--- 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
答案:
(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。