Bob thought self-driving cars were actually (safe) ________than vehicles driven by humans.

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问题 Bob thought self-driving cars were actually (safe) ________than vehicles driven by humans.

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答案safer

解析 分析句子结构可知,空格后面出现了比较级的标志词than,而且句子的主干结构为系表结构,因此空格处应填入形容词safe的比较级safer。
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