A terrible thought () Mr. Smith when he was leaving for work: what if an accident happened while his son was alone at home? ( 章节：4 难度：1)_做题室

单项选择题A terrible thought () Mr. Smith when he was leaving for work: what if an accident happened while his son was alone at home? ( 章节：4 难度：1): A、insured; B、freed; C、attacked; D、struck

正确答案：D
答案解析：
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