题目内容：
Shopping habits in the United States have changed greatly in the last quarter of the 20th century. 1 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 2 on both sides with many 3 businesses. Here, shoppers walked into stores to look at all sorts of merchandise: clothing, furniture, hardware, groceries. 4 ,some shops offered 5 .These shops included drugstores, restaurants, shoe-repair stores, and barber or hairdressing shops. 6 in the 1950s, a change began to 7 .Too many automobiles had crowded into Main Street 8 too few parking places were 9 shoppers. Because the streets were crowded, merchants began to look with interest at the open spaces 10 the city limits. Open space is what their car-driving customers needed. And open space is what they got 11 the first shopping centre was built. Shopping centres, or rather malls, 12 as a collection of small new stores 13 crowded city centres. 14 by hundreds of free parking space, customers were drawn away from 15 areas to outlying malls. And the growing 16 of shopping centres led 17 to the building of bigger and betterstocked stores. 18 the late 1970s,many shopping malls had almost developed into small cities themselves. In addition to providing the 19 of one stop shopping, malls were transformed into landscaped parks, 20 benches, fountains, and outdoor entertainment. 根据以上内容回答题。
请在1处填上正确答案。 A．As early as
B．Early
C．Early as
D．Earlier
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答案解析：