Take another look at the original sentence:

Mark searched the nearly empty refrigerator for a midnight snack his only choices were curdled milk, stale pizza, and grape jelly, any combination of which he couldn't stomach.

You wanted to fix it this way:

Mark searched the nearly empty refrigerator for a midnight snack, his only choices were curdled milk, stale pizza, and grape jelly, any combination of which he couldn't stomach.

To add a comma between snack and his would cause an equally bad problem, a comma splice. A comma splice occurs when you have two main clauses joined with a comma alone. Mark searched the nearly empty refrigerator for a midnight snack is the first main clause. His only choices were curdled milk, stale pizza, and grape jelly is the second main clause. The spot between snack and his needs a stronger break than a wimpy comma.

You might want to consult the rules for fixing comma splices and fused sentences.

Go back to the sentence to try again.

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