Because of their (rapidly) changing (economically) fortunes, many frontier towns

游客2024-01-05  8

问题 Because of their (rapidly) changing (economically) fortunes, many frontier towns of the American West (underwent) spectacular fluctuations in (population) in the nineteenth century.

选项 A、rapidly
B、economically
C、underwent
D、population

答案 B

解析
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