Question

My sister found the book interesting - 1) Neither did I. 2) So does my friend. 3) So did I. 4) So do I.

Answer 1

3.So did I.

___________

Answer 2

The correct response to "My sister found the book interesting" is:

3. So did I.

This means that you also found the book interesting, just like your sister did.

Answer 3

The correct option to complete the sentence "My sister found the book interesting" is:

3. So did I.

So the complete sentence would be: "My sister found the book interesting, and so did I."