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9.They were greatly amazed to find the city______ a lot in t

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9.They were greatly amazed to find the city______ a lot in the past ten years.
A. change
B. changed
C. to have changed
D. changing
不明白为什么选B ,C不行吗?
9.They were greatly amazed to find the city______ a lot in t
选B
但是这里的changed不是过去式,而是一个过去分词.做宾语补足语.
表示宾语the city与变化之间的被动关系.
再如:
I found a baby crying there 主动关系用现在分词
I found a baby tied to a bed 被动用过去分词