Question

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

Answer 1

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。