婚前医学检查的疾病不包括（）
A.严重遗传性疾病
B.精神分裂症
C.狂躁抑郁型精神病
D.艾滋病
E.职业病
参考答案：E
安全电压照明变压器使用双圈变压器，也可用自耦变压器。
Only after he had spent several nights working on the math problem _______ to wonder whether the problem was wrongly set.
A．that he began
B．did he begin
C．then he began
D．so that he began
