Answer:
Using the rhyme scheme of a Shakespearean sonnet this pair of lines best completes the quatrain:
“Whilst I, whom fortune of such triumph bars / Unlook’d for joy in that I honour most.”
Step-by-step explanation:
It has an iambic pentameter, three quatrains and a final couplet. When observed, the rhyme scheme is different from the usual English sonnets (ABAB CDCD EFEF GG) because there are certain lines that don’t rhyme with each other in this Sonnet.