问题补充:
Our maths teacher set so difficult an examination problem none of us worked out.
A. which
B. that
C. as
D. so that
答案:
A. which
B. that
(答案→)C. as
D. so that
解析:句意:我们的数学老师出了一个这么难的考试题,我们中没人能做出这个题来。这里是定语从句,so……as,as引导的是定语从句,as在从句中宾语,故选C。
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