It’s wise _______ you _______ your child at home alone while it’s also very important _______ him to learn to protect himself.A.of, to leave, ofB.of, to leave, forC.for, leave, forD.for, leave, of
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B解析wise修饰人 第一空用of；it是形式主语，不定式to leave是真正的主语；important修饰to learn to protect himself这件事，用for。选B。