With trees and grass __________ 60% of the urban area ,the city of Weifanghas taken on a new look.为什么这个空上要填“covering”,

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With trees and grass __________ 60% of the urban area ,the city of Weifang
has taken on a new look.
为什么这个空上要填“covering”,

覆盖了 是主动 trees and grass去覆盖起来的,没有人为的因素存在,并且因为有 with 所以Covering.