Which 'but' is a preposition?

Question

নিচের অপশন গুলা দেখুন

• We tried hard, but did not succeed.
• It is but right to admit our faults
• What can we do but sit and wait?
• There is no one but likes him.

Answer 1

সঠিক উত্তর হচ্ছে: What can we do but sit and wait?

ব্যাখ্যা: In the sentence But is used as a preposition.