新概念英语72课 It was over 30 feet in length.That's how _ it was.It was over 30 feet in length.That's how _ it was.a.length b.tall c.large d.long我想问一下这里That's how long it was.这句话是什么结构?表语从句?

新概念英语72课 It was over 30 feet in length.That's how _ it was.It was over 30 feet in length.That's how _ it was.a.length b.tall c.large d.long我想问一下这里That's how long it was.这句话是什么结构?表语从句?
新概念英语72课 It was over 30 feet in length.That's how _ it was.
It was over 30 feet in length.That's how _ it was.
a.length b.tall c.large d.long
我想问一下这里That's how long it was.这句话是什么结构?表语从句?

新概念英语72课 It was over 30 feet in length.That's how _ it was.It was over 30 feet in length.That's how _ it was.a.length b.tall c.large d.long我想问一下这里That's how long it was.这句话是什么结构?表语从句?
二楼四楼都犯错了,此处易与感叹句混淆,但这里只是how引导的表语从句.
主系表结构,毋庸置疑.
希望你满意

表语从句,没错

how long it was 是感叹句，在句子中作表语。

是表语从句，系表结构。
how long it was是个感叹句，

前面是length 名词 后面用long 形容词 这很难理解？