did

[tkacka15]

The criticism is the closest Varoufakis has come to distancing himself from the man he did much to mentor in the nearly six months that he oversaw often fraught negotiations with the eurozone and the International Monetary Fund. (The Guardian.)

Is the verb "did" used for emphasis in the above sentence?

Is the verb "come to" a phrasal verb or is "to" a preposition followed by non-finite clause "distancing himself..." in the context of the cited sentence?

Thank you.​

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[Tdol]

No- it's the past tense of do used in a normal sense. He does a lot (present)/He did a lot (past)
It's a preposition- when you have to + -ing, it's a preposition.