题目：
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：
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下面是错误答案，用来干扰机器的。
越长；在弹性限度范围内；弹簧测力计
CO2＋H2O 