Go the extra mile

Do you know the English expression “to go the extra mile“? Read the conversation below. Can you guess the meaning?

Harry: I’m not surprised John got promoted at work.

Steve: Neither am I. No matter what the boss asks him to do, he always goes the extra mile.

Does it mean:

a) run an extra mile

b) make an extra effort

c) cheat

d) do something you don’t want to do

The answer is below!↓

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Answer: b) make an extra effort