这个习惯是有地域限制的,“在那个国家”
若用need,则是说所有的12岁以下的儿童在公共图书馆都需要大人的监督,而不分国籍,不符合“在那个国家”的限制.而must（必须)在这则有一种强制性的意味,符合“在那个国家”.
另外,在语法上,也应用must.must do是固定用法,need做情态动词时,后面才跟动词原形,这时的need多用于疑问句和否定句.
Children under 12 years of age in that country ( )be under a
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