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 unde 题目和参考答案——青夏教育精英家教网—

题目内容

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

解析:

从句省略=While the workers were building…，主从句中主语一致时省略从句中的主语和were．

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