Institution: জগন্নাথ বিশ্ববিদ্যালয় Exam: C ইউনিট : 2017-2018
Topic: Miscellaneous (Others Question of English Grammer), Subject: English Grammar (ইংরেজি গ্রামার)

Best Answer Explained in Below-:

The question "____________________ him yet?" is seeking to verify if someone has met another person up to the present moment. The correct choice, "Haven't you met," is in the present perfect tense, which is appropriate for discussing actions that have relevance to the current moment.

When we use "Haven't you met," we imply that the action of meeting is important to the present context and is still possible. This structure highlights that the action may have occurred at any point leading up to now, which fits the word "yet," suggesting that there is still an expectation for meeting that person.

The other options do not fit as well:
- A) "Don't you meet" suggests a habitual action, not applicable in this context.
- C) "Weren't you meeting" implies a specific action occurring in the past and does not connect to the present.
- D) "Didn't you meet" refers to a past event that is seen as completed and does not leave room for the possibility of the meeting still happening.

In summary, "Haven't you met" effectively captures the ongoing relevance of the action, making it the most appropriate choice for the given question.