the answers to this is irony
The correct answer should be additionally.
The word additionally would provide the best transition between these two sentence. It is so because you have one idea in the first sentence, and then you want to show another idea very similar to the first one in the second sentence. Using additionally to convey that is the way to go.
Answer:
Claim
Explanation:
It is an opinion that cannot be definitively proven.
Though he once treated Ivan as if he were almost his son, his life kind of went sour after his wife left and he grew less attached to Ivan, who was a sore spot in their marriage. These days, Mack drinks and his ethics are, well, questionable.
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