对集（Set）进行操作"Set（2，？0，？1）？+？1？+？1？-？1"之后的结果为？（）A、Set（2，？0，？1，？1）B、Set（2，？0，？1）C、Set（2，？0）D、已上均不正确。
对集（Set）进行操作"Set（2，？0，？1）？+？1？+？1？-？1"之后的结果为？（）
- A、Set（2，？0，？1，？1）
- B、Set（2，？0，？1）
- C、Set（2，？0）
- D、已上均不正确。
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