Final answer:
Milton uses alliteration in Line 4 of 'How Soon Hath Time'.
Step-by-step explanation:
In line 4 of 'How Soon Hath Time,' Milton uses the poetic device of alliteration. Alliteration is the repetition of consonant sounds at the beginning of words. In this line, the words 'Cannot' and 'Countervail' both begin with the 'C' sound, creating an alliteration.
Learn more about Poetic device in 'How Soon Hath Time'