if the factory_____the river,there will be no fish in it soo

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if the factory_____the river,there will be no fish in it soon.A.left polluting C.is left pollutin
为啥子A不对.独立主格不行咩!
第二道题Such idioms and slang___in the novels are polularly used by the American teenagers.A.as are found C.as found答案A
感觉这两道题一个性质!

1.if 是连词加句子不能用独立主格,去掉if 就选A,是独立主格
2.这是定语从句因为先行词前有such 所以用as 这是句子as 做主语应用被动

if the factory___ the river ,there will be no fish in it soo if they keep polluting the river,there will be （） fish in i there will be fewer fish in the river （because of the pollut fish river the are There no in 连词成句 _____(be)there any ______(fish)in the river before? _____（be） there any fish in the river? （）（be） there any fish in the river before? there no fish in it We can fish in the river.There are many___(fish)in it.many f are,any,the,fish,river,in,there there/many/fish/in/are/river/the/ There ( )some fish in the river