问题补充：
－Mary didn’t turn up last time, did she?
－No. She . We had changed our plan.
A. shouldn’t have come
B. needn’t have to come
C. didn’t need to come
D. needn’t have come
答案：
A. shouldn’t have come
(答案→)B. needn’t have to come
C. didn’t need to come
D. needn’t have come
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