----Carol Walker didn’t turn up last time did she ?--No .She .We had changed our plan

问题补充：

----Carol Walker 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

B. needn’t have to come

(答案→)C. didn’t need to come

D. needn’t have come

解析：C.实际上没必要，也没来。 D.本不必来，但来了。