John is the tallest boy in the class, _____ according to him

John is the tallest boy in the class, _____ according to himself. A.five foot eight
John is the tallest boy in the class, _____ according to himself.
A.five foot eight as tall as
B.as tall as five foot eight
C.as five foot eight tall as
D.as tall five foot eight as
选什么?还有解释,麻烦在翻译一下这句话
再问一下关于as……as 结构的用法

选B.英语中,表示“高达-----”,“远达----”,用as+形容词+as+基数词+单位.
如：This man is as tall as eight feet.
“as + 形容词或副词原级 + as…” 意为“和……一样”,表示同级的比较,但要注意第一个as为副词,第二个as为连词.根据比较对象和性质的不同又可以把此种结构分为三种：
（一）“as…as…结构”用于表示不同人或物同一性质的比较,意为“……和……一样……".例如：
The tree is as tall as the building(is)．
这棵树和那栋楼一样高.
注意此结构也常用于形象比喻中：as cool as cucumber 沉着的,as stubborn as a mule 非常顽强的,倔强的,as clear as crystal 非常透明的,as poor as a church mouse 非常贫困的,as busy as a bee像蜜蜂一样忙碌,as easy as ABC像ABC一样容易,as deep as a well像井一样深,as light as a feather像羽毛一样轻,as soft as butter像黄油一样软.这些短语生动活泼,浅显易懂,记住这些短语可以提高学生的英语写作和口语能力.
（二）“as…as…结构”用于表示同一个人或物不同性质的比较,意为“既……又……” .例如：
This swimming pool is as wide as it is long.
这个游泳池宽度和长度相等.
（三）“as…as…结构”用于表示两个人或物不同性质的比较,表示程度相同或相当,意为“……而……”.在否定句中结构是“so/as…as…”.例如：
He was as handsome as his wife was beautiful．
他长得非常英俊,他的妻子也长得非常漂亮.
He was as experienced as his brother was green．
他经验丰富,而他兄弟却涉世未深.
He cannot run so/as fast as you.
他没你跑得快.
Danny is not so/as wise as he is witty．
丹尼为人风趣,但欠明智.
需要注意的是：“as + 形容词或副词原级 + as…”结构的变体形式是“as +形容词+ a +单数名词+ as或as + many/much +名词+ as”.意为“……和……一样……".例如：
I don't want as expensive a car as this.＝I don't want a car as expensive as this．
我不要这么贵的汽车.
This is as good an example as the other is.
这个例子和另外一个例子一样好.
Tony is as clever a boy as his brothe