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we are told that the siberian woolly Mommoth stood ______ a

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we are told that the siberian woolly Mommoth stood ______ a man and weighted as much as 10 elephants.
A.twice heihht of B.twice the height of
C.as twice high as D.twice as higher as
B
A,C,D都是语法错误---
twice是adv.,无法修饰名词(所以A错)
as……as 所修饰的必须是形容词或副词原级,且不能修饰名词短语,所以C、D错误