超声发现胎盘完全遮住子宫颈内口，称（）。

A.完全性前置胎盘

B.部分性前置胎盘

C.边缘性前置胎盘

D.低置胎盘

E.环形胎盘

—Are you free after school? 

—worry, I’ve planned to treat a friend of mine to dinner ____ for help. [ ]

A. in order            

B. in return              

C. in turn              

D. in honor