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It’s ________ to leave a child alone.

A. safe B. danger

C. safety D. dangerous


D  safe形容词,“安全的”;danger名词,“危险”;safety名词,“安全”;dangerous形容词,“危险的”。根据It is + adj.+to do sth.结构与句意“把孩子一个人单独留在家里是危险的”可知选D。


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