单选题 When she was invited to dinner, she readily accepted.
【正确答案】 D
【答案解析】[解析] 本句意思：当她被邀请去吃晚饭时，她欣然接受了。readily意思是“欣然地，乐意地”，与willingly(乐意地)意思相近。suddenly突然；firmly坚固地，坚定地；really真正地，事实上。