题目内容
（请给出正确答案）
[主观题]
Mark is older than Frank, but younger than David. If m, f, and d represent the ages, in ye
ars, of Mark, Frank, and David, respectively, which of the following is true？
______d＜f＜m
______f＜m＜d
______d＜m＜f
______f＜d＜m
如搜索结果不匹配，请 联系老师 获取答案
