Beijing ( )a lot in past ten years.now it has become one of the biggest modern( )in the world.has changed,citieshad changed,cities

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Beijing ( )a lot in past ten years.now it has become one of the biggest modern( )in the world.has changed,citieshad changed,cities

Beijing ( )a lot in past ten years.now it has become one of the biggest modern( )in the world.has changed,citieshad changed,cities
Beijing ( )a lot in past ten years.now it has become one of the biggest modern( )in the world.
has changed,cities
had changed,cities

Beijing ( )a lot in past ten years.now it has become one of the biggest modern( )in the world.has changed,citieshad changed,cities
has chanded
cities
in the past...years和现在完成时连用
one of 后面用复数名词

答案是has changed,cities
Beijing (has changed )a lot in past ten years.now it has become one of the biggest modern(cities )in the world.
用完成时表示从过去到现在,并且可能继续延伸下去的状态!

had changed,cities

has changed, cities
in past ten years 是从过去一直持续到现在的一段时间,所以用现在完成时。