There is no need to add in trees to create shade because many town and city gardens are ______ shaded by buildings.A.occasionallyB.instantlyC.permanentlyD.roughly
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C解析试题分析：考查副词辨析。句意：不需要多植树来获得阴凉，因为许多城镇和城市花园长久地被大楼遮挡着。A偶尔；B立即，马上；C永久地；D粗略地，大体上。故选C。
考点：考查副词辨析