I choose swimming class as my optional subject.
我把游泳课作为我的选修课。
The new teaching standard has regulated that mathematic history is an optional subject in the middle school.
新课标中已明确规定数学史作为选修内容进入中学课程。
The new teaching standard has regulated that mathematic history is an optional subject in the middle school.
新课标中已明确规定数学史作为选修内容进入中学课程。
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