It should be "What are you doing here?"

[Bhikkhu1991a]

English Grammar Tests, Elementary Level

ESL/EFL Test #261 "Dialogue Comprehension (6)", question 1

What you are doing here? .........

(a) Yes, that's right.
(b) I can't hear her.
(c) I came to visit my mother.
(d) She is hard of hearing.

English Grammar Tests, Elementary Level

ESL/EFL Test #261 "Dialogue Comprehension (6)", answer 1

What you are doing here? I came to visit my mother.

Correct answer: (c) I came to visit my mother.

Your answer was: correct
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Hello,

The question is wrong; it should be "What are you doing here?" instead. I hope that you will correct it as soon as possible.

Thank you.

Best wishes,
Bhikkhu1991a.

[Mister Micawber]

Thanks, Bhikkhu. I've fixed it and the other mistake in that quiz set. Corrected versions will appear with our next database update.
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Native English teacher at Mister Micawber's

[Aiken]

Dear teachers,
Why the word "came" in the sentence is past tense?

Thank you
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Man proposes; God disposes

[Beeesneees]

You are there now which means you came (arrived) earlier - perhaps only a minute or so, perhaps longer... but either way it happened in the past.

"I have come to visit my mother," would be an alternative statement, especially if you are just arriving.
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Cheers m' dears!