问题描述：
问题解答：
wangtangxin 网友的回答是正确的。be surprised at... 对……惊奇 这是固定搭配。We are surprised at the great changes in Shanghai.这里，Shanghai中的“h”不用大写。
we are surprised by the great changes in shanghai.
We are surprised at the great changes in ShangHai.
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