单选题
While building a highway across the desert, ______
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
【正确答案】
C
【答案解析】
[考点] 句子结构
[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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