While building a highway across the desert, ______

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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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