-----he was walking down the road,he was singing a song.A.when B.until C.As D.That

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-----he was walking down the road,he was singing a song.A.when B.until C.As D.That

-----he was walking down the road,he was singing a song.A.when B.until C.As D.That
-----he was walking down the road,he was singing a song.A.when B.until C.As D.That

-----he was walking down the road,he was singing a song.A.when B.until C.As D.That
A.when

C,他一边沿着路走,一边哼着歌

c ,表示动作同时发生 ,when表示一前一后发生