As far as I know, this maths problem is _______________ that one.A．twice so diff

题干

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

上一题下一题 0.85难度单项选择更新时间:2010-06-19 05:23:08

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