2. 外语
  3. Not until the dedication of Yellowstone Park in the late nineteenth century______a national park.

Not until the dedication of Yellowstone Park in the late nineteenth century______a national park.

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问题 Not until the dedication of Yellowstone Park in the late nineteenth century______a national park.
选项 A、the United States had
B、did the United States have
C、when the United States had
D、the United States having
答案B
解析 此题是语法结构题，考查倒装结构的用法。带否定意义的短语not until用在句首，后面跟一个从句做状语，主句要使用倒装语序。在此题中主句的谓语动词是实义动词had，用部分倒装，即did+主语+have。因此，根据题意和语法规则，选项B是最佳答案。
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