If you want to incorporate 'for a year", you would need to say 'I have been in Poland for a year.'
But as 'been to' suggests just a visit and not a long stay, you may want to use "I had gone to Poland a year ago.'
Answer:
c. The first appearance tells when the article was cited by the essay writer, while the second appearance tells when the article was produced.
Explanation:
In spite of betraying Guy, Mildred is a character who is sympathetic.
Another suggestion for a thesis:
Though she betrayed Guy, Mildred is quite sympathetic.
Helpful or Helpless is the adjective to help