meaning of "you are an asset to our team"

[Huyen]

English Grammar Tests, Elementary Level

ESL/EFL Test #86 "Common English Errors (2)", question 9

You're an asset to our team. .........

(a) Stay it up!
(b) Remain doing it!
(c) Keep it up!
(d) Continue it up!

English Grammar Tests, Elementary Level

ESL/EFL Test #86 "Common English Errors (2)", answer 9

You're an asset to our team. Keep it up!

Correct answer: (c) Keep it up!

Your answer was: incorrect
You're an asset to our team. Remain doing it!
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Plesae explane me the meaning of "you are an asset to our team".

Thanks a lot
Huyen

[Cornelius]

you're an asset to ateam may mean.. that you are a key part of the team..

[Mister Micawber]

.
Well, not necessarily a 'key' part, but a decided advantage:

Quick definitions: asset (noun): a useful or valuable quality (One Look Dictionary Search)
.
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Native English teacher at Mister Micawber's