Question

b) Here is a story.
I want to tell it. (that)
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Answer 1

Answer:

Here is a story that I want to tell.

Explanation:

Hope it helps you mate.

Answer 2

Answer:

1/ Here is a story that I want to tell.

2/ Here is a story that I want to tell about.

Explanation: Here, in your sentence ( it ) refers to that story, so do not use ( that + it ) both .