While building a tunnel through the mountain, ________ .
A．a(chǎn)n underground lake was discovered
B．there was an underground lake discovered
C．a(chǎn) lake was discovered underground
D．the workers discovered an underground lake
D　
從句省略="While" the workers were building…，主從句中主語一致時(shí)省略從句中的主語和were．
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