问题补充:
Last term our maths teacher set so difficult an examination problem none of us worked out.
A. that
B. as
C. so that
D. which
答案:
A. that
(答案→)B. as
C. so that
D. which
解析:as引导定语从句修饰examination problem,在从句中作宾语,因其先行词前有限定词so。若看作so…that…结构,结果状语从句应加宾语,为worked it out。
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