患者，女，31岁，已婚。曾孕3次，均自然流产，平日头晕耳鸣，腰膝疫软，精神萎靡，现又妊娠33天，夜尿频多，面色晦暗，舌淡苔白，脉沉弱。诊为滑胎，其证候是：

A．气虚

B．血虚

C．脾虚

D．肾亏

E．以上均非

Not until he left his home ________ to know how important the family was for him.[ ]

A. did he begin  

B. had he begun

C. he began  

D. he had begun