句子的“I”是不是He呢?
D.when 是正确选项.
why很明显不对,意思不通的.是he他是如此高兴的因为他收到了·····嗯，那就不错， He才对。如果是表示原因，那么要用because，而不是用why。如果有because选项，那么也是对的。如果句子里用why应该怎么改why通常用来表示结果，用法很多，要看具体的句子如果是这个句子我想用why应该怎么说1,He received an invitation from his friend to visit Chongqing.That was why he was so excited.2,The reason why he was so excited was that he received an invitation from his friend to visit Chongqing.