I postponed to taking my driving test until I was absolutely sure that I had mastered the technique of driving.

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I postponed to taking my driving test until I was absolutely sure that I had mastered the technique of driving. (*) to taking (*) until (*) had mastered (*) of driving

This is a companion discussion topic for the original entry at https://english.best/questions/24395,i-postponed-uto-takingu-my-driving-test-uuntilu-i-was-absolutely-sure-that-i-uhad-masteredu-the-technique-uof-drivingu/