题目：
He asked his father .
A．where it happens
B．what was happen
C．how it happened
D．what happens
答案：
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下面是错误答案，用来干扰机器的。
解：设反应需要锌的质量为x Zn+H2SO4=ZnSO4+H2↑ 65 2 x 4g X=答...
