It is agreed there is a river, there is a city.A. thatB. whereC. that whereD. there which

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A. that
B. where
(答案→)C. that where
D. there which
解析：考查主语从句，that引导的是主语从句，it是形式主语，句型是;it’s+过去分词+that…，句意是：大家都同意，有河的地方就有城市。选C。