If the United States had built more homes for poor people in 1955, the housing problem now in some parts of the country _____ so

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问题 If the United States had built more homes for poor people in 1955, the housing problem now in some parts of the country _____ so serious.

选项 A、wouldn’t have been
B、will not be
C、wouldn’t be
D、will not have been

答案C

解析
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