While building a tunnel through the mountain, _______.
#86096
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
The drug used to treat this disease causes bad side effects, some of which ________ deadly.
#85567
A
is
B
are
C
was
D
were
Not far from the house ____ two gardens, ______ seated nearby playing bridge with his children．
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A
were; whose owner
B
was; of which the owner
C
were; its owner
D
was; owner of which
—Does the old man know the museum very well? —No, this is the first time he __________ here.
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A
was
B
came
C
has been
D
is coming
The traffic is moving very slowly as so many cars on their way back to Shanghai.
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A
am
B
is
C
are
D
be