Question

The teacher set such a difficult problem ________none of us could solve.

1. A.
   that
2. B.
   so that
3. C.
   which
4. D.
   as

Answer 1

D
定語(yǔ)從句考查題。先行詞problem有such修飾，關(guān)系詞只能用as不能用that或 which，as在從句中做solve的賓語(yǔ)。