Xiao Dong was seriously hurt when when he fell from the tree.serious 是形容词,换成副词seriously,修饰hurt
Tom was walking along the street when he suddenly fell down.从句用过去式
Xiao Dong was seriously hurt when when he fell from the tree.serious 是形容词,换成副词seriously,修饰hurt
Tom was walking along the street when he suddenly fell down.从句用过去式