To a worker, ________ from the point of view of society is necessary labor is from his own point of view voluntary play.
A
本题要求填入一个关系代词引导主语从句，并在主语从句中作主语，所以选what。
Thetrafficwasheldupformorethanthirtyminutes,________causedmetoarrivelate.
Itisobvioushowbadmovieswillimpact________children.
名词解释：silentpartnership
名词解释：abilloflading
名词解释：copyright