He felt aggrieved ___________ the decision made by the committee without considering his opinion.

• শূন্যস্থানে সঠিক উত্তর হবে - at.
- Complete sentence: He felt aggrieved at the decision made by the committee without considering his opinion.

• Aggrieve (at/over something)
English meaning: Feeling resentment at having been unfairly treated.
Bangla Meaning: অন্যায় ব্যবহারে ক্ষুব্ধ হওয়া/ক্ষোভ বোধ করা।

• অর্থাৎ, কোনো কিছুর উপরে ক্ষুদ্ধ বুঝাতে Aggrieve এরপর preposition হিসাবে at বসে।

Example Sentence:
1. The students were aggrieved at the sudden change in the exam schedule.
2. She was aggrieved at the loss of her beloved pet.

Source:
1. Oxford Dictionary.
2. Accessible Dictionary by Bangla Academy.