He the problem in his mind for a whole week before he did anything about it.
A. switched; on
B. kicked; up
C. turned; over
D. took; on
网友回答
A. switched; on
B. kicked; up
(答案→)C. turned; over
D. took; on
解析：句意：在采取措施之前，他在脑中将这个问题反复思考了一个星期。turn over :to think about carefully仔细考虑；switch on把开关打开；kick up引起；take on呈现、雇用、承担。