题目内容：
A.充要条件
B.充分不必要条件
C.必要不充分条件
D.既不充分也不必要条件
参考答案：
答案解析：
选择题：A.充要条件
- 题目分类：高考
- 题目类型：选择题
- 查看权限：VIP
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