摘要： parents say and do has a life-long effect on their children. A. That B. Which C. What D. As [解析] C所填选项引导主语从句.且在从句中充当say和do的宾语.可排除A.D两项,which引导宾语从句时意为“哪一个 .表示选择.与句意不符.故选C.

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