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

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

出自：国家开放大学英语语法

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