问题
选择题
As far as I know, this maths problem is _______________ that one.
A．twice so difficult as
B．twice as difficult as
C．as twice difficult as
D．so twice difficult as
答案
答案：B
考查倍数的表达法。倍数的表达倍数应放在最前边，可排除C和D，此题的结构为：倍数+ as…as，句意：据我所知，这道数学题是那道数学题的两倍难。所以选B。