Have you ever been bitten by a dog?

The correct answer is: A. Has a dog ever bitten you?

The other options are incorrect because they use the past tense, which is not appropriate for this question. The question is asking about a past event that may or may not have happened, so the present perfect tense is used.

• Option B: Had a dog ever bitten you? is incorrect because it uses the past perfect tense. The past perfect tense is used to talk about an event that happened before another event in the past. In this case, there is no other event in the past that the event of being bitten by a dog would have happened before.
• Option C: Did a dog ever bite you? is incorrect because it uses the simple past tense. The simple past tense is used to talk about events that happened in the past and are not connected to the present. In this case, the event of being bitten by a dog is connected to the present because the question is asking about whether or not it has ever happened.
• Option D: Has a dog ever bite you? is incorrect because it uses the simple present tense. The simple present tense is used to talk about events that happen regularly or repeatedly. In this case, the event of being bitten by a dog is not something that happens regularly or repeatedly, so the simple present tense is not appropriate.