Difference between current and currents

[Guest]

Test No. incompl/advan-42 "Consider this", question 10

If you want to keep ......... with the latest developements in your field, you have to read the relevant magazines.

(a) currant
(b) current
(c) currents
(d) currently

Test No. incompl/advan-42 "Consider this", answer 10

If you want to keep current with the latest developements in your field, you have to read the relevant magazines.

Correct answer: (b) current

Your answer was: incorrect
If you want to keep currents with the latest developements in your field, you have to read the relevant magazines.
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I think "current" is used here as an adjective but why doesn't "keep" demand the adverb "currently"?

[Alan]

An interesting question. Here the adjective is a complement and adds to the description of the subject you and doesn't qualify the verb keep.
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