suddenly millie heard someone ( )in the next room 1cry 2crying 3cried 4cries

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suddenly millie heard someone ( )in the next room 1cry 2crying 3cried 4cries

2crying

2crying
hear sb crying 听到某人在哭
hear sb sry 听到某人哭的全过程

应该是crying 意思是听到某人正在哭泣 是正在 所以用crying