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    The problem with being a time waster is _____the online game playing often spills over into the periods of time that should be productive.
    A．whatB．whichC．thatD．whether
    C
    本题考查名词性从句。句中that引导表语从句，在从句中不作任何成分，但在表语从句中不可以省略，故选C。
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