以上属于乙类传染病的是（）

A.鼠疫

B.流行性腮腺炎

C.布鲁菌病

D.水痘

E.传染性单核细胞增多症

— Alice,why didn't you come here yesterday? 　

— I ____, but my son suddenly fell ill and I had to take him to the hospital.　

A.had　

B.did　

C.was going to　

D.didn't