— Where are the children? The dinner's going to be completely ruined.

— I wish they ________ always late. [ ]

A. weren't  

B. hadn't been

C. wouldn't be  

D. wouldn't have been

第五次人口普查，我国人口为十二亿九千五百三十二万人，写作（    ），省略亿后面的尾数约是（    ）亿人。