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 |
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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 |