Children under 12 years of age in that country _must_be under adult supervision when in a public library.
答案是A.首先根据这个句子的含义“在那个国家,12岁以下的孩子在公共图书馆,必须有成年人监护”--作为一个条款,must体现了强调的语气功能.
may & can 语气较弱,不适合
而need ,表示需要,如果是情态动词的身份,则通常是否定形式出现,如果是普通动词,则采用need to do 形式.
Children under 12 years of age in that country __be under adult supervision when in a public library.
Children under 12 years of age in that country __be under adult supervision when in a public library.
A.mustB.mayC.canD.need
A.mustB.mayC.canD.need
英语人气：233 ℃时间：2019-10-23 01:26:22
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