C
concentrate v.全神贯注,精神集中,专心致志;集中,集合;浓缩
We should concentrate all our efforts on improving education.我们应该集中精力努力改进教育工作。
Troops are concentrating south of the river.军队正向河的南边集结。
n.浓缩液
【用法】concentrate(sth.)on sth./doing sth.
【全真考题】Anne couldn't concentrate what she was doing while her family were watching TV.(93.1)
A.to B.on C.for D.in