问题标题：
【Ofthetwopens,theboychose____AtheonemostexpensiveBthelessexpensiveoneCtheleastexpensiveDthemostexpensiveofthem】
问题描述：
Ofthetwopens,theboychose____
Atheonemostexpensive
Bthelessexpensiveone
Ctheleastexpensive
Dthemostexpensiveofthem
华蓓回答：
B因为是两个物品,不会有最高级的问题,所以用比较级
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