Answer: snug as a gun
Explanation:
"The simile 'snug as a gun' is startling when it appears in the poem "Digging." After just a line and a half, Heaney has already created an image of a writer sitting down to quietly reflect and contemplate, with the pen "resting" and "snug." When "gun" follows these two peaceful words, it suggests that the poem won't be.."
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Sentences with errors in parallel structure have conflicting tense and structure. The correct answer is C.
