Answer: B
同 (tóng): same, alike.
同事 (tóngshì): colleague; fellow worker
同学 (tóngxué): classmate.
同志 (tóngzhì): comrade.
同窗 (tóngchuāng): schoolmate, schoolfellow.
If you know the meanings of these four words above, it is clear that B is the correct answer.
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