The children ___ happily yesterday .A.sang B.sing C.song

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The children ___ happily yesterday .A.sang B.sing C.song
x) HUHI)JSWH,(̩TL-.I-JITs+NKWp+Rzy6IEDi+j~ p/.H̳e< b';VX~Oϋ+{6c /:ּo=:^| g%@>nhB

The children ___ happily yesterday .A.sang B.sing C.song
The children ___ happily yesterday .
A.sang B.sing C.song

The children ___ happily yesterday .A.sang B.sing C.song
A

有yesterday这个词,表明是一般过去式所以用sing的过去式sang。