There is no need to add in trees to create shade because many town and city gardens are shaded by buildings.
A. occasionally
B. instantly
C. permanently
D. roughly
网友回答
A. occasionally
B. instantly
(答案→)C. permanently
D. roughly
解析：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。