以上的答案都是有错误的.as happy as the day is long就是非常快乐的意思.as什么什么as the day is long 是一种非常口语的说法.如果您说as angry as the day is long 或者as excited as the day is long,意思就是非常生气或者非常兴奋.You can say as ...as the day is long and it just makes the meaning of the adjective used stronger.用 as ...as the day is long 的句型时,...是个形容词.
