Last term our maths teacher set so difficult an examination problem none of us worked it

发布时间：2020-08-14 23:46:02

Last term our maths teacher set so difficult an examination problem      none of us worked it out. 
A. that
B. as
C. so that
D. which

网友回答

(答案→)A. that
B. as
C. so that
D. which
解析：so. . . that. . . 状语从句.
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