Many boys and girls learn English at school or at university.Because it is one of their---[subject]

问题描述:

Many boys and girls learn English at school or at university.Because it is one of their---[subject]
在虚线上填写括号内的适当形式,答案是subjects,请[详细]解释,谢谢………………~~

是这么多的科目之中的之一.是复数形式啊