While building a tunnel through the mountains, ______.
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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
推荐题目
____ in thought, he almost ran into the car in front him.
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A
Losing
B
Having lost
C
Lost
D
To lose
—What do you think made Mary so upset? —_______ her new bike. 
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A
As she lost
B
Lost
C
Losing
D
Because of losing
Why do you have the water _____ all the time? 
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A
ran
B
to be running
C
running
D
being running