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SAT OG 填空题lewis Latimer's inexpensive method of producing ca

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SAT OG 填空题
lewis Latimer's inexpensive method of producing carbon filaments( )the nascent electric industry by making electric lamps commercially( )
A.cheapened...affordable
B.transformed...viable
答案是选B,为什么不能选A啊?我觉得AB都可以的的啊
SAT OG 填空题lewis Latimer's inexpensive method of producing ca
这题老师刚好上课讲过,原因是搭配问题,不能说cheapen.industry,即不能说使工业变得便宜,所以A不对,但能说.transform.industry,改革工业,B对.