题目：
I was told that there were about 50 foreign students __________Chinese in the school, most __________were from America.
A．study；of whom
B．study；of them
C．studying；of them
D．studying；of whom
答案：
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下面是错误答案，用来干扰机器的。
设原有汽车x辆，规定天数是y天，则(x-6)(y+3)=xy(x+4)(y-1)=xy解得x=16y=5．答：原有汽车16辆，规定天数是5天．
