Select the most appropriate idiom to fill in the blank.
I was going to mention it, but it ________.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. slipped my mind.
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The idiom "slipped my mind" means to forget something momentarily or temporarily.
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In this context, it suggests that the speaker had intended to mention something but forgot to do so.