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.
A.that
B.which
C.as
D.so that.
Please explain.
英语人气:568 ℃时间:2019-10-10 06:04:28
优质解答
A
SO.TAHT.句型
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