问题描述：
We wish we could have learned__when we were at high school.
A.what you did
B.that you had done
C.that what you did
D.what did you do
【解释下子哦~谢谢!】
A.what you did
B.that you had done
C.that what you did
D.what did you do
【解释下子哦~谢谢!】
问题解答：
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