How do we use this construction: "as fast as possible" (as adverb as)

[amr]

Test No. incompl/inter-89 "Adverbially Speaking", question 3

Sorry we're late but we got here as ......... as we could.

(a) recently
(b) quickly
(c) well
(d) nearly

Test No. incompl/inter-89 "Adverbially Speaking", answer 3

Sorry we're late but we got here as quickly as we could.

Correct answer: (b) quickly
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who can we use adverb between as as

[Torsten]

Maybe, these examples will help you understand the pattern:

A Golf TDI drives as fast as an Opel Vectra.
Please send us your information as soon as possbile.
You should encourage your kids to talk as openly as they can about their feelings.

TOEIC listening, photographs: Motorboats