While building a tunnel through the mountain, _____.

A. the workers discovers discovered

B. an underground lake was discovered

C. there was an underground lake discovered

D. the lake was discovered underground

A


解析:

考查一致性（非謂語動詞作狀語，其邏輯主語必須與句子主語保持一致；如果不一致，則要用獨立主格結(jié)構(gòu)或用從句。building的主語應(yīng)是人，故答案為A；

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