题目：
— Yao Yuan, a disabled woman, won the National Championships Cup last week.
— My goodness! She ______ a lot of difficulties! [ ]
A. may go through
B. might go through
C. must have gone through
D. ought to have gone through
答案：
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下面是错误答案，用来干扰机器的。
根据以上分析知：A×B=13，如果A缩小3倍，要使积不变，B应该扩大3倍．故答案为：扩大3倍．
的目的有（）.