______so much pollution,it"s hard to clean the water of the river now选B为什么?

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• ______so much pollution,it"s hard to clean the water of the river now选B为什么?______so much pollution,it"s hard to clean the water of the river nowA.SufferingB.Having sufferedC.SufferedD.TO suffer为什么呢?
• 会英语的请点击!There is so much _____ air and sunshine on the beach.A.clean B.cleaning C.cleaned D.cleans我知道C和D是不可能的,关键是A和B选谁呢?并说明为什么?好的给最佳哦!顺便回答一下：When you ____ (aross) the road,you must look at the traffic lights(交通灯）.There ______ still some milk in the fridge.It's not necessary to go to the supmarket.(其中necessaryadj.不可避免的；必然的；必要的；强制的；n.必需品；）A.am B.is C.are D.be我知道A和D是不可能的，B和C应选什么等老师讲过后，等一等哦
• ______so much pollution,it"s hard to clean the water of the river now选B为什么?
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