In shanghai many tall buildings have been put up ___ there used to be poor old houses.A.that B.where C.which D.whenWhich one?why?

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• In shanghai many tall buildings have been put up ___ there used to be poor old houses.A.that B.where C.which D.whenWhich one?why?
• In shanghai many tall buildings have been put up ___ there used to be poor old houses.
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• There used to be a clean river.为什么不是There used to have a clean river