speak是較為正式的在公開場合的演說, speak to sb 同某人講話..
say是最為普遍通用的說,可說say something或say something to somebody,say常與直接引語連用
talk是談?wù)撃呈?不及物動詞
tell在某人告知事實(shí)或提供信息時使用,常與what,where等詞連用.
你可以多做一些例題,多體會一下就知道了,下面有幾個句子你可以看一下：
Do you speak Chinese?你說漢語嗎?
Look!Our teacher is talking 看,我們的老師正在演講呢.
Idon’t know what he said.我不明白他所說的
When I was young, my mother often told me a story in the evening.
在我小時,媽媽晚上常給我講故事.
所以說選C