原句是Progress has been so far very good.
so far时间状语,它可以放在句首,句中,句末是吗?
时间状语放在句中是放在哪个位置?
这个短语位置没有特别规定,如:
So far the police investigation has drawn a blank.(《牛津词典》)
What have you found so far?(《柯林斯英汉双解大辞典》)
Research have so far proved inconclusive.(《柯林斯英汉双解大辞典》)
基本上时间状语位置也是如此,如:
At the age of 20, I left school.
I left school at the age of 20.
I, at the age of 20, left school.