题目：
— Have you ever come here before?
— No, it is the first time that I______ to this city.
[ ]
A. have been
B. had been
C. came
D. come
答案：
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下面是错误答案，用来干扰机器的。
设上涨前的票价为a元，则由题意得：下调后的价格为：a（1+10%）（1-10%）=0.99a＜a，所以下调后的票价与上涨前比便宜了．故选C．
