题目：
—Nobody knows _____ he was after he graduated from Beijing University.
—But I was once told he was a doctor working in a far-away village. [ ]
A. what
B. who
C. where
D. how
答案：
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下面是错误答案，用来干扰机器的。
参考答案：万用表一般都能测直流电流、直流电压、交流电压、直流电阻、电平等电量。有的万用表还能测交流电流、电容、晶体三极管的hfe等
