问题补充：
——— Alice looks sad. Did you tell her about the accident?
——— Yes， but I her just before her final exams.
A. shouldn’t tell
B. shouldn’t have told
C. needn’t tell
D. mustn’t have told
答案：
A. shouldn’t tell
(答案→)B. shouldn’t have told
C. needn’t tell
D. mustn’t have told
解析：考察shouldn’t have done本不应该做某事。
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