How pleased he was (to hear )what the teacher had said.
他多么高兴啊,听到老师说的话!
也可以这样说：
How pleased he was when he heard what the teacher had said.
用pleased表示很高兴做某事,对.感到很高兴,有下面的两种表达：
be pleased to do sth.
be pleased with sth.
例如：
Very pleased to hear from you.
很高兴收到你们的来信.
I am only too pleased to do business with you.
我能和你做生意,太高兴了.
They were all very pleased with the news.
他们听到那消息都很高兴.
I am pleased to see you again.
我很高兴再次见到你.