In these lines from Keats 'Ode to a Nightingale'
'The heart aches, and a drowsy numbness pains
My sense as though of hemlock i had drunk Or emptied some dull opiate to the drains one minute past and Lethe-wards had sunk',
the poet uses

A. alternative rhymes
B. heroic couplet
C. bank verse
D. octosyllabic metre  
E. terza rima.

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Correct Answer: D