I wrote my answer on my laptop, then took a photo and attached it. Hope it helps and it is what your looking for!
The speaker suddenly saw a thrush singing a song.
Explanation:
The Darkling Thrush is a english poem written by Thomas Hardy. The speaker in this poem describes about the cause for despair and hoplessness.
The speaker suddenly saw a thrush(bird) singing a beautiful and hopeful song and it knows something more than the speaker.
The bird was old, skinny and small with his feathers rumpled by the wind. The thrush's appearance in the poem suggests a solution to the cultural decay that the speaker tells in the first half of the poem.
Semicolon. This is because it’s like a run on of the sentence rather than another part of that makes any sense.
The question mark obviously wouldn’t work and neither would colon since colon is sort of like, listing examples. Comma would make the sentence sound weird.
Hope this helps!