如果数a的倒数是-1，那么a2020等于（     ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27159' and id < 2250233 and id<>'2250233' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27159' and id > 2250233 and id<>'2250233' order by id asc limit 5