B:what 这句话的意思是：他说的话十分正确.
相关有一些例句：
What I could see was only a large blue point.
What he need to say is just 'sorry'.
What she heared was a wonderful tone.
多注意平时看到的句子的句式,把眼前的题如果能够套到你知道的句式里,做题就轻松些了^_^