The World Expo (世博会) ____________ in Shanghai now. 
#42723
A
being had
B
is having
C
is holding
D
is being held
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They          a good time because it rained heavily.
#37978
A
have
B
had
C
didn’t have
D
don’t have
Listen! Someone _____ songs.
#41840
A
are singing
B
singing
C
sing
D
is singing