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children under 12 years of age in that country be under adul

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children under 12 years of age in that country be under adult supervision when in a public library.
a.must bmay c need.为什么不选A呢?
children under 12 years of age in that country be under adul
must表示主观上的一定必须;need表示客观上需要.语境是法律规定,是客观需要,所以要用need
再问: 表示公共纪律,规章制度要求:也用must.mustn't , You must be early. You mustn't smoke here.
再答: You must be early. You mustn't smoke here. 这两句也是主观命令式的~