单项选择题

If the United States had built more homes for poor people in 1955, the housing problems now in some parts of the country （） so serious.

A. wouldn’t be
B. wouldn’t have been
C. will not be
D. would have not been

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By the end of this week, he surely （） a collection of 2020 stamps.

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By the end of this month, we surely （） a satisfactory solution to the problem.

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