Darkness was ............. closing in.
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hardly
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highly
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gradually
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honestly
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heartily
C
Correct answer
Explanation
'Gradually' is the correct answer as it means 'slowly over time' or 'by degrees', which perfectly describes darkness slowly closing in or approaching. 'Hardly' (barely), 'highly' (very), 'honestly' (truthfully), and 'heartily' (enthusiastically) don't convey this sense of slow, progressive change.