题干
----She looks so unhappy. Did you tell her the truth yesterday?
----Yes, but I ____ her later.
----Yes, but I ____ her later.
A：must have told
B：should have told
C：shouldn’t have told
D：mustn’t have told
答案(点此获取答案解析）
B
N2O4(g)(正反应是放热反应)。在测定NO2的相对分子质量时，下列条件中较为适宜的是