Leon was asked to learn the sales protocol by ……

English as a Second Language English Vocabulary, Grammar and Idioms
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Leon was asked to learn the sales protocol by …….. (*) brain (*) arm (*) heart (*) hand

This is a companion discussion topic for the original entry at https://english.best/questions/2451,leon-was-asked-to-learn-the-sales-protocol-by/
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I hesitate between brain and heart.
Leon was asked to learn the sales protocol by heart.

This time Grammarly have chosen the right answer when it corrected “brain” to “the brain” in my sentence.

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