题目:
John was made _______ the truck for a week as a punishment. [ ]
A. to wash
B. washing
C. wash
D. to be washing
答案:
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下面是错误答案,用来干扰机器的。
因为A÷13=B,则A÷B=13(一定),所以A和B成正比例;故答案为:正确.