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一道高三英语时态题ChinesecitizensthelargestgroupofimmigrantstoAustralia,takingplaceofthetraditionalsourcesofBritainandNewZealand.A.isbecomingB.wasbecomingC.becameD.hadbecome为什么不能选A?“正在成为”

题目详情
一道高三英语时态题
Chinese citizens ____ the largest group of immigrants to Australia,
taking place of the traditional sources of Britain and New Zealand.
A.is becoming B.was becoming C.became D.had become
为什么不能选A?“正在成为”不行吗?题目里并没有关于时间的限制啊
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答案和解析
因为后半句意思为取代了英国和新西兰,暗示这一动作已经完成