One of my colleagues came to me with this question which appears on a college entrance exam for Japanese high school students;
The tree rings can also reflect a year ( ) which there were insect plagues.
The possible answers to the blank are: at in of on
I quickly removed 'at' and 'of' as choices, but I ran into difficulties in deciding between 'in' and 'on'.
At first I thought 'in' was the correct choice, but after looking at the perculiar use of '...a year...' and '...were...plagues' I was thinking 'on' would be the correct choice due to the subjunctive voice of the sentence.
Any thoughts on the answer would be appreciated!!
