______ label to each of the trees, with detailed introduction of their features, and visitors will know more about them and how to protect them.A.To attachB.AttachC.AttachedD.Having attached
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B解析考查特殊句式。祈使句+连词+陈述句=If 条件句，主句。句意：把附有这些树详细的介绍的标签贴在树上，游客会对他们又更多的了解并知道怎么保护他们。