Only when he left his hometown and went abroad_______ he loved his parents very much.

A．has he realized

B．did he realize

C．he realized

D．he had realized

承包人应按工程所在地行政管理机关的（）对劳务作业人员的宿舍和食堂进行管理。

A.标准和要求

B.创建文明活动

C.卫生城市评比

D.绿色施工