What does 'postpone' mean?

[zuzicka]

Test No. errors/advan-8 "Admire his Achievement", question 3

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

(a) to taking
(b) until
(c) had mastered
(d) of driving

Test No. errors/advan-8 "Admire his Achievement", answer 3

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

Correct entry: taking
The error was: (a) to taking
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What does 'postpone' mean?

[Alan]

Postpone taking my test means I will take the test at a later date.
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English as a Second Language
You can read my ESL story Only Three Letters