A-A+
To change the light source is costly because y
问题详情
To change the light source is costly because you have to change the whole fixture．
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参考答案
正确答案：G
Tochangethelightsourceiscostlybecauseyouhavetochangethewholefixture．译文改变光源的成本高昂，因为要替换整套灯具。定位由题干关键词changethewholefixture定位到原文画线处。
