2. 外语
  3. While building a highway across the desert, ______

While building a highway across the desert, ______

admin2012-02-26  31
问题 While building a highway across the desert, ______
选项 A、an underground town was discovered
B、there was an underground town discovered
C、the workers discovered an underground town
D、a town was discovered underground
答案C
解析 由while building可知，动作的发出者必须是build的逻辑主语，应为workers，故可排除A、B、D。
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