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 degree in January,【C2】______and March. But the northeastern and northcentral regions of【C3】______have been financial and industrial centers, 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 southern parts of the country【C5】______it is warmer. Many go to Florida where the weather is【C6】______. Others go to the southwestern states of Arizona, New Mexico and Texas where they【C7】______dry desert climates.
    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 home communities and move south to begin a new life【C10】______senior citizens.
    Their children likely 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【C15】______many offices and factories in the south. California is already the most popular state in the country.
【C9】

选项 A、when
B、where
C、unless
D、though

答案A

解析 这是一个由连词when引导的时间状语从句。
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