题干
写出下列动词的过去式。
①stay____ ②go____ ③visit____ ④swim____
⑤study____ ⑥have____ ⑦rain____ ⑧ do____
⑨are____ ⑩spend____ ⑪ play____ ⑫ come____
答案(点此获取答案解析）
stayed,went,visited,swam,studied,had,rained,did,were,spent,played,came
2FeCl2+2KCl+I2；