He tried very hard to think of her name, which slipped his mind at the effort.
Is it ok?
Thank you.
This is OK: He tried very hard to think of her name, which had slipped his mind. I don't see how to make "at the effort" fit the sentence.
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This is OK:
He tried very hard to think of her name, which had slipped his mind.
I don't see how to make "at the effort" fit the sentence.