Answer:
The two sentences that show Ivan Ilyich's struggle with his life and his inability to let go of his past are:
A. For three whole days, during which time did not exist for him, he struggled in that black sack into which he was being thrust by an invisible, resistless force.
C. That very justification of his life held him fast and prevented his moving forward, and it caused him most torment of all.
Step-by-step explanation:
From the excerpt, Ivan Ilyich's struggles with his life and inability to let go of his past stems from the fact that he cannot seem to free himself from the black sack into which he has been forced in by an "invisible, restless force" and also that looking back at his life and its justification prevented him from making progress and gave him the most torment of all.