Some college students are seen doing work they can find to support themselves. A. thatB.

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A. that
B. which
C. whatever
D. no matter what
解析：句意：一些大学生被看见为了养活自己做他们能找到的任何工作。这里do后面是宾语从句，宾语从句中缺少定语，whatever可以做定语，连接宾语从句，that不能做定语，which是“哪个”，不符合句意，no matter what只能引导让步状语从句。选C。