The river has become very dirty和the river has been very dirt

The river has become very dirty和the river has been very dirt The water in this river is very dirty because it has been se The river became dirty last year.The river has became dirty The oath to become the river of time has been什么意思 1.The river is very dirty.It smells_____（terrible） 英语翻译He goes on and comes to a river.The river has become ver The river ________ (become) dirty since the paper factory wa the river has frozen中间为什么没有been The river behind our house was very dirty in the past 改句保持句意 根据句意补全英语单词1：The river is very dirty,I think there will be mo The river is very dirty.______ people want to swim in it. The river is very dirty,__ people want to swim in it