（天津六校一联模拟）A wide range of postcards and other souvenirs are ________ sale in the visitors' center.A.onB.atC.inD.of
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A解析句意：各种各样的明信片和纪念品在游客中心出售。on sale--(esp of goods in shops, etc) available to be bought（尤指商店等的货物）出售，上市。又如：The new model is not on sale in the shops.这种新款式商店还没有卖。