Final answer:
Option D, 'The chef, using a new recipe for roast pork,' is a sentence fragment because it lacks a main verb, leaving the sentence incomplete.
Step-by-step explanation:
The sentence fragment among the provided options is D. The chef, using a new recipe for roast pork. This sentence lacks a complete thought because it does not have a main verb that shows what the subject (the chef) is doing with the new recipe. It leaves the reader expecting additional information to complete the idea.
To review questions related to comma usage:
- I finally found my keys, and I got to work just in time.
- Mrs. Contreras threw out her old coffee table and cleaned the carpet. (No comma is needed here because the second clause is not independent.)
- Taking the elevator to the roof, we hoped we could see the skyline and the bay. (No comma is needed before 'and' because it is not connecting two independent clauses.)
- Though Susan wasn't feeling well, she went to the store anyway and bought ice cream, pizza, and candy.
- I let my neighbor borrow my phone because she said hers was tapped by the police. (No comma is needed here as it does not precede a coordinating conjunction that links two independent clauses.)