The river has become very dirty和the river has been very dirty 哪个对

The river has become very dirty和the river has been very dirty 哪个对 The oath to become the river of time has been什么意思 Once these,has become the English has become the national The river has already r____ several meters. The boy with the lucky smile has become my best friend.为什么是has become 用become 不可以吗 chinese dream has become the hottest word of 2013 为什么用has become The river ________ (become) dirty since the paper factory was opened up. The river became dirty last year.The river has became dirty for ___ ___. The new railway station has been in _ since 2003,now it can _ people.(service)People _ the river in the past,but now the _ has become better.(pollute)We began to use the station in 1998.=The station _ _ _ _ since 1998.=The station _ _ _ _ since 1998. another bridge has being built over the river 怎么翻译? china has many rivers,theyangtze river is the longest the river has frozen中间为什么没有been The river has risen several metres.several metres 是什么成分 翻译 The little mark has become a scar. the internet has already become part of our life. All has become the past ···翻译 the internet has become a part初一阅读理解