You’re here because either you or someone you know______been diagnosed as type Ⅱ diabetic. ( )

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问题 You’re here because either you or someone you know______been diagnosed as type Ⅱ diabetic. (    )

选项 A、are
B、had
C、has
D、have

答案C

解析 分析句子结构可知,关系分句you know是someone的后置定语,根据就近一致原则,been前的谓语动词应与someone一致,应用单数形式。句子未体现过去的时间概念,排除选项B。答案为C。
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