Shopping habits in the United States have changed greatly in the last quarter of the 20th century.【B1】______in the 1900s most Am

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问题     Shopping habits in the United States have changed greatly in the last quarter of the 20th century.【B1】______in the 1900s most American towns and cities had a Main Street. Main Street was always in the heart of a town. This street was【B2】______on both sides with many【B3】______businesses. Here, shoppers walked into stores to look at all sorts of merchandise: clothing, furniture, hardware, groceries.【B4】______, some shops offered【B5】______. These shops included drugstores, restaurants, shoe-repair stores, and barber or hairdressing shops.【B6】______in the 1950s, a change began to【B7】______. Too many automobiles had crowded into Main Street【B8】______too few parking places were【B9】______shoppers. Because the streets were crowded, merchants began to look with interest at the open spaces【B10】______the city limits. Open space is what their car-driving customers needed. And open space is what they got【B11】______the first shopping centre was built. Shopping centres, or rather malls,【B12】______as a collection of small new stores【B13】______crowded city centres.【B14】______by hundreds of free parking space, customers were drawn away from【B15】______areas to outlying malls. And the growing【B16】______of shopping centres led【B17】______to the building of bigger and better stocked stores. 【B18】______the late 1970s, many shopping malls had almost developed into small cities themselves. In addition to providing the【B19】______of one-stop shopping, malls were transformed into landscaped parks,【B20】______benches, fountains, and outdoor entertainment.
【B11】

选项 A、when
B、while
C、since
D、then

答案A

解析 考查语法知识——时间状语从句的引导词。when“在…时候”,引导时间状语从句,符合题意,因此正确答案为A。while指“在…期间”;since表示“自从”;then“那时”,均不符合题意。
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