问题补充：
The new group of students are better-behaved than the other group who stayed here
A. early
B. earlier
C. earliest
D. the earliest
答案：
A. early
(答案→)B. earlier
C. earliest
D. the earliest
解析：句意：新的一组学生比先前在这儿的另一组学生更有礼貌。early早，是原级；earlier 是其比较级；earliest是最高级。该句有than说明要用比较级，故选B。
考点: 考查副词的等级的用法。
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