【解析】答案为C。“介词 + 关系代词”引导定语从句,at which中的which指代前面的rate,它前面一般加介词at表示“以……速度”。
15. Sometimes our success depends on ______ we are lucky or not and sometimes it depends on the manner ______we conduct our life.
A. whether; of which B. whether; in which C. that; by which D. that; for which 【答案】B.
【解析】答案为B。第一空构成whether ... or not 结构,表示“是否……”;第二空缺定语从句的引导词,该定语从句的先行词是表示方式的manner,而表示“以某种方式”用in a manner,所以第二空应用in which。
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