He seemed to ____ writing all day long. There are two possible answers.
What is correct? "He seemed to be writing all day long." or "He seemed to have been writing all day long"
Those are both possible. "He seemed to be writing all day long" describes his habitual past behaviour, or his past behaviour as observed during the course of a specific day. "He seemed to have been writing all day long" describes how the situation appeared at the end of a specific day.
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Those are both possible.
"He seemed to be writing all day long" describes his habitual past behaviour, or his past behaviour as observed during the course of a specific day.
"He seemed to have been writing all day long" describes how the situation appeared at the end of a specific day.