下列法律行为中，属于无偿单务法律行为的是 （   ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='26674' and id < 2220417 and id<>'2220417' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='26674' and id > 2220417 and id<>'2220417' order by id asc limit 5