问题描述：
He is the most careful student in our class（改为比较级） He is ---- ----- than ---- ——- in our
He is the most careful student in our class（改为比较级）
He is ---- ----- than ---- —— —— in our class
He is the most careful student in our class（改为比较级）
He is ---- ----- than ---- —— —— in our class
问题解答：
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