问题补充：
You must your studies and get ready for the college entrance examinations.
A. concentrate on
B. centre in
C. devote to
D. devoted to
答案：
(答案→)A. concentrate on
B. centre in
C. devote to
D. devoted to
解析：“我们必须把注意力集中在学习上为高考做好准备。”concentrate on“集中注意力”
