I ..... her since we met a year ago.

Adidn’t see

Bhaven’t been seeing

Chadn’t seen

Dhaven’t seen

Answer:

"Haven’t seen" is in the present perfect tense, which is used to describe an action that started in the past and continues up to the present (ഇത് ഭൂതകാലത്തിൽ ആരംഭിച്ച് presentൽ തുടരുന്ന ഒരു പ്രവർത്തനത്തെ വിവരിക്കാൻ ഉപയോഗിക്കുന്നു). It correctly indicates that from the point of meeting a year ago up to the present, the speaker has not seen her.
"I haven’t seen her since we met a year ago." / ഒരു വർഷം മുമ്പ് ഞങ്ങൾ കണ്ടുമുട്ടിയതിന് ശേഷം പിന്നീട് ഞാൻ അവളെ കണ്ടിട്ടില്ല.
"Didn't see" is in the simple past tense.
"Haven’t been seeing" is in the present perfect continuous tense. It suggests a continuous action.
"Hadn’t seen" is in the past perfect tense, which is used to describe an action completed before another past action.

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