问题
选择题
I_____the 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
C
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。