对于首次发作晕厥的患者，可不住院诊治的情况包括（）

A.器质性心脏病患者

B.心电图有异常

C.有猝死家族史

D.无器质性心脏病，心电图正常，初次评估考虑神经介导性晕厥

E.从事高危行业的工作人员

Speaker A: This exercise is really beyond me.
Speaker B: ().

A. When do you think you can work it out

B. Why not come to me

C. When did your teacher give you this math assignment

D. Our math teacher is too hard on us.