题目来源
题目来源1 : The Princeton Review
正确率：54%
难度：5
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ABCD is a square. Points E and F, not shown, are the midpoints of BC and CD respectively. Line segments are drawn to connect points E and F to A. Which of the following must be true?Indicate all possible values.
A,B,C显示答案
以上解析由 考满分老师提供。
