Ithe problem in my mind for a whole week before I did anything about it.A. switched; onB.

问题补充：

Ithe problem in my mind for a whole week before I did anything about it.

A. switched; on

B. kicked; up

C. turned; over

D. took; on

答案：

A. switched; on

B. kicked; up

C. turned; over

D. took; on

解析：题意：在采取措施之前，我在脑中将这个问题反复思考了一个星期。turn over 仔细考虑；switch on把开关打开；kick up引起；take on呈现、雇用、承担。