, I'm glad you made that mistake, for it will serve as a warning to you.
A. In case
B. In a way
C. In return
D. In relief
网友回答
A. In case
(答案→)B. In a way
C. In return
D. In relief
解析：短语辨析。A以防：B在某种程度上；C作为回报；D鲜明，显著；句意：在某种程度上，我很高兴你犯了那个错误，因为我可以给你警告。故B正确。