be used to vs get used to

[Sultano]

choose : and what is the difference between them?
When I came fisrt ti Britain it took me a long time to ........................on the left.
a) be used to driving
b) get used to driving

[Mister Micawber]

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'Get' is the action of becoming; 'be' is the condition or situation.
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Native English teacher at Mister Micawber's