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In each answer key unit, alongside the correct answers, include (e.g., an answer marked as correct that actually contains a common learner error). Students must find it by comparing the answer key with their own work or a provided hint. The twist: the "error" is explained in a hidden box at the bottom of the page—but students only get to reveal it after they identify the mismatch.
Here’s an interesting feature for the Success In Grammar 1 Answer Key :
