Look, the Maths teacher with his students _________on the grass to have a good rest at present.
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A
is lying
B
is lieing
C
are lying
D
be lying
推荐题目
--Why does the lake smell terrible?    ---Because large quantities of water ______.
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A
have polluted
B
is being polluted
C
has been polluted
D
have been polluted
While building a tunnel through the mountain, _______.
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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