问题:
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
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 |
参考答案: