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請依下文回答第 11 題至第 15 題 　　Before the invention of the at-home refrigerator in 1913, it was rare to find a strawberry in the winter ora gala apple in the spring 11 it had been preserved. Jams, jellies, and preserves were developed byindustrious fruit eaters of days 12 as methods of keeping fruits fresh out of season. When the option tofreeze and refrigerate became available, fresh food that was in season in warmer climates could 13 a tripelsewhere for consumption, removing the need for old-time preservation techniques. 14 no longer anecessity, some older methods of storing foods became traditional delicacies. Fruit jams, jellies, andpreserves have 15 beyond becoming outdated and remained popular sweet spreads for breads,sandwiches, and many other foods.
11
(A) once
(B) or else
(C) unless
(D) since

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