I didn’t know Lisa came from Australia until she began to __

选C.
speak的意思是“说话”,作不及物动词,通常指说话的能力和方式,也有“演讲,发言”之意；作及物动词时,其后宾语多是表示语言的名词.speak to常表示“同……说话”.
Do you speak English?你会说英语吗?
She is speaking to the shop assistant．她正在同售货员说话.
Say 意思是“说”,强调说话内容.例如：
--"What are you saying?" “你在说什么?”
-- "I'm saying nothing." “我什么也没有说.”
Please say it in English.请用英语说.
Talk 意思是“谈”,与介词to 或with 连用表示“与…交谈”,与介词about 或of连用表示“谈论…内容”.例如：
May I talk to you?我可以和你谈一谈吗?
Xiao Li is talking with her teacher.小李正和她的老师谈话呢.
What are you talking about?你们在谈论什么呢?
tell的意思是“讲”、“告诉”,作及物动词,意为“讲述”、“告诉”,指把一件事或一个故事讲出来,有连续述说的意思,如：tell the truth（说实话）,tell a lie（说谎）,tell a story（讲故事）等,tell可接双宾语结构或复合宾语结构,有时表示“嘱咐或语气较轻的命令”,常用于tell sb．（not）to do sth．结构中.例如：
Please tell us the good news.请告诉我们好消息.
I have something to tell you.我有事要告你.
Do you have anything to tell us?你有什么事要告诉我们吗?

A say