Last week our maths teacher set so difficult an examination problem___ none of us worked out.

Last week our maths teacher set so difficult an examination problem___ none of us worked out.

题目
Last week our maths teacher set so difficult an examination problem___ none of us worked out.
A.that
B.which
C.as
D.so that.
Please explain.
答案
A
SO.TAHT.句型
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