The city of Xi'an _____(become) cleaner and cleaner

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The city of Xi'an _____(become) cleaner and cleaner
为什么不是被动?

ecome作为系动词时没有被动语态
become作为系动词时,通常后面接形容词,意思为变得,变成.
作为动词时,后面接名词,意思是成为.
例如：I become unfamiliar wtih them.
我对它们有些生疏了.unfamiliar adj.
His wish is to become a pilot.
他的愿望是当飞行员.a pilot n.

The city of Xi'an _____(become) cleaner and cleaner The water is becoming cleaner and cleaner after the _______ the water is becoming cleaner and cleaner after the( )(close The rivers in the village is cleaner than _____ in the city. The city will be cleaner and more beautiful in the future.(对 will,the,cleaner,city,and,future,the,more,in,be,beautiful(连词 the air in the country is cleaner than ___ of a city make the air cleaner and cooler英语翻译 introduce the city of xi'an the cleaner’s job is _____(clean) the streets. 一道英语题目,求讲解 Xi'an is a city in the _____ of China the classroom is___after cleaning A.clean and tidy B.cleaner