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

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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。