i saw a bird ____ to the north A fly B flying C flys D flied

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isawabird____tothenorthAflyBflyingCflysDfliedisawabird____tothenorthAflyBflyingCflysDfliedisawabird_

i saw a bird ____ to the north A fly B flying C flys D flied
i saw a bird ____ to the north A fly B flying C flys D flied

i saw a bird ____ to the north A fly B flying C flys D flied
B
see sb/sth doing sth 意为 看见某人(某物)正在做某事

B flying

B.
see sb doing sth.