Question

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

A．which

B．that

C．a(chǎn)s

D．so that

Answer 1

C

試題分析：句意：我們的數(shù)學(xué)老師出了一個這么難的考試題，我們中沒人能做出這個題來。這里是定語從句，so……as，as引導(dǎo)的是定語從句，as在從句中賓語，故選C。
點評：本題難度適中。定語從句是高中階段必須掌握的語法項目，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。考查非限制性定語從句的介詞+which結(jié)構(gòu)。the leaves of which 相當(dāng)于 whose leaves。