问题
选择题
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
答案
答案：C
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。