They were preparing to cross the river when it began to rain.

他们正准备过河，突然下雨了。

youdao

They were preparing to cross the river when it began to rain.

他们正准备过河，突他们正准备过河，他们正准备过河然下雨了。

youdao

They were preparing to cross the river when it began to rain.

他们正准备过河，突他们正准备过河，他们正准备过河然下雨了。

youdao