选D
英语中倍数的表达法常见的有：
1:A + be +倍数+as +形容词原级+as+B 如：
This tree is three times(twice) as tall as that one.
这棵树比那棵树高三倍（两倍）.
2:A + be +倍数 +形容词比较级+than+B 如：
This tree is three times(twice) taller than that one.
这棵树比那棵树高三倍（两倍）.
3:A + be +倍数 +计量名词+of+B
如：
This tree is three times(twice) height of that one.
这棵树比那棵树高三倍（两倍）.