They saw something strange flying in the sky.Something strange ___ ___ flying in the sky被动语态

They saw something strange flying in the sky.Something strange ___ ___ flying in the sky被动语态
They saw something strange flying in the sky.Something strange ___ ___ flying in the sky被动语态

They saw something strange flying in the sky.Something strange ___ ___ flying in the sky被动语态
was seen

was seen

Something strange _was_ _seen_ flying in the sky