To a worker, ________ from the point of view of society is necessary labor is from his own point of view voluntary play.
- A. what
- B. which
- C. that
- D. it
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正确答案： A
本题解析：
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。
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