21．--Look, the tall building looks very modern． --Yes, and there is a garden on its ．A garden in the air!A．top B．ground C．side D．floor 【查看更多】

 

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--Look, the tall building looks very modern．

--Yes, and there is a garden on its            ．A garden in the air!

A．top                      B．ground               C．side                D．floor

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