My life experiences have merely served to confirm the wisdom of his remarks,so over the years they keep _______in my mind. ( 章节：7 难度：4)_做题室

单项选择题My life experiences have merely served to confirm the wisdom of his remarks,so over the years they keep _______in my mind. ( 章节：7 难度：4): A、echo; B、echoes; C、echoing; D、sound

正确答案：C
答案解析：
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