2. 外语
  3. The 21st century【C1】______a boom in online shopping for shopping on the internet can be accessible, economical and convenient, w

The 21st century【C1】______a boom in online shopping for shopping on the internet can be accessible, economical and convenient, w

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问题     The 21st century【C1】______a boom in online shopping for shopping on the internet can be accessible, economical and convenient, which dynamically changes the people’s life. With the time advances, shopping habits are evolved accordingly. When【C2】______the past, you will find the United States in the 20th century have experienced great changes in shopping habits. Early 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 lined on both sides with many【C3】______businesses. Here, shoppers walked into stores to look at all sorts of merchandise: clothing, furniture, hardware, groceries.【C4】______, some shops offered【C5】______. These shops included drugstores, restaurants, shoe repair stores, and barber or hairdressing shops.【C6】______in the 1950s, a change began to【C7】______. Too many automobiles had crowded into Main Street【C8】______too few parking places were【C9】______shoppers. Because the streets were crowded, merchants began to look with interest at the open spaces【C10】______the city limits. Open space is what their car driving customers needed. And open space is what they got【C11】______the first shopping centre was built. Shopping centers, or rather malls,【C12】______as a collection of small new stores【C13】______crowded city centers. 【C14】______by hundreds of free parking space, customers were drawn away from【C15】______areas to outlying malls. And the growing【C16】______of shopping centers led【C17】______to the building of bigger and better stocked stores.【C18】______the late 1970s, many shopping malls had almost developed into small cities themselves. In addition to providing the【C19】______of one-stop shopping, malls were transformed into landscaped parks,【C20】______benches, fountains, and outdoor entertainment. With the diversities of shopping habits, people’s behaviors presented mirror changes of the times in miniature.
【C11】
选项 A、when
B、while
C、since
D、then
答案A
解析 语法知识。这是时间状语从句，需填入连词。when意为“在……时候”，while意为“在……期间”。when和while引导时间状语从句的区别在于：when接延续性动词／短暂性动词，而while接延续性动词；when引导的从句的谓语动词可以在主句谓语动作之前、之后或同时发生，而while引导的从句的谓语动作必须是和主句谓语动作同时发生。since表示“自从”，主句用完成时。
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大学英语四级

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