作业帮children under 12 years of age in that country be under adul
来源：学生作业帮 编辑：作业帮 分类：英语作业 时间：2024/05/17 06:15:53
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?
a.must bmay c need.为什么不选A呢?
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～
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～
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