患儿，8岁，急性白血病。采用HDMTX-C. F化疗方案，使用大剂量后停药期间可应 用下列哪种药物作为救援药

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30793' and id < 2479849 and id<>'2479849' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30793' and id > 2479849 and id<>'2479849' order by id asc limit 5