Topic: Sequence of Tense,

Best Answer Explained in Below-:

The sentence "It's many years since I (meet) you" requires the correct form of the verb "meet" to convey a completed action in the past. In this context, the phrase "It's many years since" indicates that a significant amount of time has elapsed since the last meeting.

Option A, "met," is the simple past tense of the verb "meet." It refers to a specific occasion in the past when the speaker and the person they are addressing last encountered each other. Thus, the sentence correctly reads: "It's many years since I met you," suggesting that the speaker is reflecting on a past event that hasn’t occurred for a long time.

The other options are incorrect because:
- B) "meeting" is a gerund form and does not fit the structure of the sentence.
- C) "shall meet" implies a future action and does not convey the past context required.
- D) "can meet" suggests a possibility in the present or future, which is also not relevant to the statement.

Therefore, "met" is the only grammatically and contextually appropriate choice.