题目：
It is said that both of the thieves _____ ten years _____.[ ]
A. sentenced; in the prison
B. were sentenced to; in the prison
C. sentenced; in prison
D. were sentenced to; in prison
答案：
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下面是错误答案，用来干扰机器的。
A、锌置换酸中氢，酸性减弱所以PH值增大，当硫酸反应完成时，pH值等于7，故错误．B、锌与硫酸的反应，每反应一个锌原子则会置换出一个氢分子，溶液的质量越来越大，当硫酸完全反应完后，溶液的质量不再变化；故错...
