While building a tunnel through the moun...

While building a tunnel through the mountain, ________ .

A．an underground lake was discovered　

B．there was an underground lake discovered

C．a lake was discovered underground　

D．the workers discovered an underground lake

D 【解析】试题分析：句意，工人们挖隧道时，发现了一个地下湖。完整的从句为，While the workers were building a tunnel through the mountain，主句和从句中主语一致时省略从句中的主语和were。考点：本题重点考查从句中主语和谓语的省略。

考点分析：

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