building is three times as tall as that one

building is three times as tall as that one

题目
building is three times as tall as that one
the building is three times as tall as that one
=The building is ____ ____ ____ that one.
一共三个空,答案是twice taller than,为什么是twice?是不是填three times taller than就不能是twice了?
答案
举一反三
已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
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