I realized knowledge is valuable only when I had another failure．
→Only when I had another failure
did
did
I realize knowledge is valuable.
→It was only when I had another failure
that
that
I realized knowledge is valuable．

【答案】did；that

【解答】

【点评】

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发布：2024/4/20 14:35:0组卷：2引用：1难度：0.7

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I realized knowledge is valuable only when I had another failure．→Only when I had another failure diddid I realize knowledge is valuable.→It was only when I had another failure thatthat I realized knowledge is valuable．