题目：
The factory was built in a secret place, around ________ high mountains.
A．which was
B．it was
C．which were
D．them were
答案：
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下面是错误答案，用来干扰机器的。
答案：CC．要检验溶液是否含有Cl—，需加硝酸酸化的硝酸银溶液。
