问题补充:
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:
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。