18.1997年,苏州园林被联合国教科文组织列入“世界遗产名录”。 A: After 1997, Suzhou gardens were inscribed on the World Heritage List<br/>by U B: In 1997, Suzhou gardens were inscribed on the World Heritage List by<br/>U C: In 1997, Suzhou gardens were inscribed on the World Heritage List by<br/>UNESC D: Until 1997, Suzhou gardens have been inscribed on the World Heritage<br/>List by UNESC