解析：Because of their (rapidly) changing_考试试题_托福

【单选题】Because of their (rapidly) changing (economically) fortunes, many frontier towns of theAmerican West (underwent) spectacular fluctuations in (population) in the nineteenth century.
A、rapidly
B．economically
C．underwent
D．population

网考网参考答案：B
网考网解析：
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