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It is true that at times the U.S.A. has experienced periods of _______ unemployment as well as labor shortages.
A. available                         B. acute
C. accessible                      D. ashamed
B

试题分析:考查形容词:A. available可获得的,B. acute严重的;敏锐的;急性的;剧烈的,C. accessible易接近的, D. ashamed羞愧的,句意:这是真的美国有时会经历严重的失业和劳动力短缺问题。所以选B。
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