单选题
关于标签，下面说法正确的是（）。
A标签的属性必须加在起始标签里
B
这对标签是放在文件体里的</p><p><span>C</span>→img>这个标签是个正确的标签</p><p><span>D</span>标签必须有起始标签和结束标签</p></div><div class="info"><h3 class="title">正确答案</h3><script>ai2();</script><div class="text"><img alt="来源：www.examk.com" src="data:image/png;base64,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" 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