"I have been asking you." is correct. Remember that any 'continuous' tense is going to have an -ing ending, like Murat said. The second sentence is almost a 'present perfect passive', but it's missing an object. It should be, "I have been asked by you." Be aware: 'perfect passive' tenses are almost always avoidable and they are very rarely used.

Thanx murat for response

I think the first sentence, and one of the reason is that, continous tense always demand ''ing'' ending.