Question

I know the year in __ dua was born
( 1 ) was
( 2 ) which
( 3 ) where
( 4 ) when ​

Answer 1

2) Which


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Answer 2

I know the year when dua was born.

Explanation:

1.Option "was" should not be used because it forms meaningless sentence when two was in a same sentence continuously.

2.Option "which" should not be used because it refers to things but here we are refering time.

3.Option "where" should not be used  because it refers to place  but here we are refering time.

4.So Option "when" is the correct answer because it is the one which refers to time.