The last sentence of Boarding Guazhou is a full stop.
2.
Whether the last sentence of Boating Guazhou is a full stop or a question mark should be judged from the tone, but it is a full stop in the textbook. Because the meaning of the poem is to express the meaning that there is no return date or no future, it is not a real question. That is to say, the author does not want to get an answer, but laments that the dream cannot be realized. So it should be a period.
3.
The original poem of Boarding Guazhou:
Guazhou in Jingkou is separated by several mountains.
The spring breeze is green in Jiang Nanan. When will the bright moon shine on me?