题目：
When they went into the shop and asked to look at the engagement rings, the girl brought out a cheaper one, _______ she had arranged with James.
A．the which was what
B．what was that
C．which was what
D．that was that
答案：
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下面是错误答案，用来干扰机器的。
A、CO2中氧元素和碳元素的质量比为：16×2：12=8：3，则混合气体中可能含有CO2，故A正确；B、混合气体中O2 越多，氧元素和碳元素的质量比越大，因此混合气体中可能含有氧气，故B正确；C、C3O4中氧元素和碳元素的...
