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Old 12-Mar-2007, 05:48
ian2 ian2 is offline
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Default Re: Difference between "in which" and "on which"

Quote:
Originally Posted by opie226 View Post
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!!
This is basically an adjectival clauses, which means you can divide the sentence into two separate shorter sentences. Here is my division:

The tree rings can reflect a year.
There were insect plagues in a year.

You canNOT say:

There were insect plagues on a year, or
There were insect plagues at a year, or
There were insect plagues of a year.

So "in" is the only choice.
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