Question

Our maths teacher set so difficult an examination problem ______ none of us worked out.

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

Answer 1

C
試題分析：句意：我們的數(shù)學(xué)老師出了一個(gè)這么難的考試題，我們中沒人能做出這個(gè)題來。這里是定語(yǔ)從句，so……as，as引導(dǎo)的是定語(yǔ)從句，as在從句中賓語(yǔ)，故選C。
考點(diǎn)：考查定語(yǔ)從句的用法。
點(diǎn)評(píng)：本題難度適中。定語(yǔ)從句是高中階段必須掌握的語(yǔ)法項(xiàng)目，考生容易誤選AB，這里是特殊的固定搭配，不能用that或which，在結(jié)果狀語(yǔ)從句中that不作成分，故選C。
即學(xué)即練：I saw some trees，the leaves of  ______  were black with disease.
A. that        B. which        C. it         D. what
解析：B�？疾榉窍拗菩远ㄕZ(yǔ)從句的介詞+which結(jié)構(gòu)。the leaves of which 相當(dāng)于 whose leaves。