―Catherinelookssad.Didyoutellherabouttheaccident?―Yes,...

问题详情：

 ― Catherine looks sad. Did you tell her about the accident?

― Yes, but I ________ her just before her final exams. 

       A. shouldn’t tell                                               B. mustn’t have told     

C. needn’t tell                                                  D. shouldn’t have told

【回答】

知识点：虚拟语气与情态动词

题型：选择题