摘要：30．While building a tunnel through the mountains, . 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 mountains, ______.
| 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 |
While building a tunnel through the mountains, ______.
|
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 mountains, _____________.
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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