The parents are making changes to their previous education methods, of ______ negative effect they b...
2022-09-01 03:03:27 208次 天津市2019届高三第三次月考（含听力）英语试卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
The parents are making changes to their previous education methods, of ______ negative effect they begin to be aware.
A. who B. whom C. whose D. which
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