they have found a tortoise on the river bankon the river bank的提问.是对划线部分的提问哦~划线部分为on the river bank

they have found a tortoise on the river bankon the river bank的提问.是对划线部分的提问哦~划线部分为on the river bank
they have found a tortoise on the river bank
on the river bank的提问.
是对划线部分的提问哦~划线部分为on the river bank

they have found a tortoise on the river bankon the river bank的提问.是对划线部分的提问哦~划线部分为on the river bank
他们在河岸上发现了一只乌龟

他们在河岸上已经发现了一只乌龟！

where have they founded the tortoise ?