It’s ________ to leave a child alone.

A. safe B. danger

C. safety D. dangerous


D  safe形容詞，“安全的”；danger名詞，“危險(xiǎn)”；safety名詞，“安全”；dangerous形容詞，“危險(xiǎn)的”。根據(jù)It is + adj.+to do sth.結(jié)構(gòu)與句意“把孩子一個(gè)人單獨(dú)留在家里是危險(xiǎn)的”可知選D。


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