Listen! The girls _____________ “Happy new year” in the next room.
#40044
A
are singing
B
singing
C
sing
D
are sing
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Hurry up! The film            for ten minutes.
#41853
A
was on
B
started
C
has been on
D
has started
They have been skating __________.
#40389
A
for three hours
B
since three hours ago
C
three hours ago
D
since three hours