问题
选择题
In the final exam of last term, our maths teacher Mr.Wu gave us ________we all couldn’t work out .
A．such a difficult problem that
B．so a difficult problem as
C．so difficult a problem that
D．as difficult a problem as
答案
答案：D
本题考查状语从句。本题考查so/as + adj. + a/an + n. + as或such + a/an + adj + n. + as结构，根据其结构，故选D。