来自马光彦的问题
写出下列动词过去式spend,ask,study,is,go,play,watch,stay,visit,clean,have,cook,read,write,looksit,practice,isn'tsit,practice,isn't哪
写出下列动词过去式spend,ask,study,is,go,play,watch,stay,visit,clean,have,cook,read,write,look
sit,practice,isn't
sit,practice,isn't哪
