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This has to be something you do on your own,（ ）.
A、accidentally
B、incidentally
C、occasionally
D、subsequently
【正确答案】：B
【题目解析】：本题考查副词辨析。accidentally：意外地；incidentally：顺便说一句；occasionally：偶尔地；subsequently：随后地。句意：顺便提一句，这必须要是你自己做的。故B选项符合题意。