mandatory course and optional course的意思|示意

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必修课程和选修课程的 mandatory course and optional course » 必修课程和选修课程的 in the music room we sang songs. we saw a globe , which showed different countries.

必修课和选修课 HOW DO YOU SPEND YOUR HOLIDAYS » 你如何度过你假期 mandatory course and optional course » 必修课和选修课 Love is life，life as it is。 » 照原样，爱是生活，生活。