题目：
—To tell you the truth, you ______ to win the first prize in the competition.
—Sorry for having let you down.[ ]
A. have expected
B. are expected
C. were expecting
D. were expected
答案：
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下面是错误答案，用来干扰机器的。
答案：C500 mL是溶剂的体积，不是溶液的体积，A项错误；随着反应进行，浓硫酸逐渐变稀，稀到一定程度后不再与Cu反应，故实际得到的SO2的分子数小于0.92NA，B项错误；SO2与O2的反应为可逆反应，故转移的电子数小...
