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这个which后面有没有逗号?the primary role of government which is to protect its citizens

题目详情
这个which后面有没有逗号?
the primary role of government which is to protect its citizens
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答案和解析
为什么要加which呢?
没有which是个完整的句子,加了which看不懂,后面还有句子?
the primary role of government is to protect its citizens.