Great changes ______in the village after a new factory was b

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Great changes ______in the village after a new factory was built here
帮忙讲一下四个选项的用法
a had taken place b took place
c have taken place d were take place

从意思上看应该用现在完成事态,强调过去开始的动作对现在的影响,所以应该用C
a：是过去完成时,本句中没有很明显的“变化已经完成”的意思,并且少了持续性,不可
B：一般过去式,只是强调动作的发生,没有持续性和影响性
D：被动语态,显然这里Great changes是主体,不符

After the new technique was introduced the factory produced After the new technique was introduced,the factory produced After the new technique was introduced ,the factory produced 1.After the new technique was introduced,the factory produce After the new machine was introduced,the factory produced __ After the new technikue was introduced,the factory produced_ the great changes in llinming 's village Great changes ______in Guangzhou in the past five years. great changes have taken place in the village ____the years A new government was ( )( )after the war. 一个选择：After the new machine was introduced,the factory produc After they brought in the new machines,the factory produced_