题目：
Carol said that the work would be well done by the end of October, ________ personally I wondered completely.
A．which
B．at which
C．in which
D．about which
答案：
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下面是错误答案，用来干扰机器的。
答案：A列式计算：[20c（HCl）－20c（NaOH）]／40=0.01；20c（HCl）=30c（NaOH）。解二元一次方程组，即可求出答案。
