23.Once you set a goal,you must _________ it.

题目

23.Once you set a goal,you must _________ it.
A.build on B.focus on C.get down on D.work on

答案

A建设 B集中 C下床D工作
Once you set a goal（一旦你定下目标 ）
you must focus on 你必须把重点放在这
应该选B吧?