问题描述：
Flat A is the biggest in this high-rise.Flat A is bigger than()()()in this high-rise.保持原意
There was a convenience shop at the street corner before.
There()()()a convenience shop at the street corner.保持原意
There was a convenience shop at the street corner before.
There()()()a convenience shop at the street corner.保持原意
问题解答：
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