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
Great changes ______in the village after a new factory was b
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