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  3. The northern parts of the United States get very cold in the winter. It snows a great deal and the temperature often goes【C1】___

The northern parts of the United States get very cold in the winter. It snows a great deal and the temperature often goes【C1】___

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问题     The northern parts of the United States get very cold in the winter. It snows a great deal and the temperature often goes【C1】________zero in January,【C2】________and March. But the northeastern and north central regions of the country 【C3】________financial and industrial centers for a long time, and they are heavily polluted.
    In recent years, people in these regions have begun to take vacations【C4】________these cold winter months. They go to the southern parts of the country【C5】________it is warmer. Many go to Florida where the climate is【C6】________. Others go to the southwestern states like Arizona, New Mexico and Texas where they【C7】________a dry desert climate.
    It has become【C8】________nowadays for old people to move south to these places【C9】________they retire. Typically these people sell their houses in their original communities and move south to begin a new life【C10】________senior citizens.
    Their children probably have homes【C11】________and many of them are moving south【C12】________communities where they were【C13】________.The southern and southwestern parts of the country are now growing【C14】________any other part.
    Business and industry have【C15】________many offices and factories in the south. California is already the most popular state in the country.
【C3】
选项 A、have
B、have been
C、had been
D、were
答案B
解析 句意：但是美国的东北部和北部中心区域长期以来都是经济和工业中心，并且它们被严重污染了。根据句意和前一分句中的时间状语for a long time(长期以来)可知，这里应用现在完成时，即谓语动词用“have／has+过去分词”的形式，表示动作从过去某个时间开始，延续到现在，并仍然可能延续下去。故选B。
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