Dr. Sarah Mitchell _______ an expert in renewable energy _______ will keynote the conference.
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readingWhich choice completes the text so that it conforms to the conventions of Standard English?
A
an expert in renewable energy
B
, an expert in renewable energy
C
, an expert in renewable energy,
D
—an expert in renewable energy
Correct Answer: C
Choice C is the best answer. This question tests comma usage with appositives.
- Context clues: "An expert in renewable energy" renames Dr. Mitchell (appositive).
- Meaning: Nonessential appositives are set off by commas on both sides.
- Verify: "Dr. Sarah Mitchell, an expert in renewable energy, will keynote..." correctly brackets the appositive.
💡 Strategy: Set off nonessential appositives with commas on both sides.
Choice A is incorrect because it lacks both commas. Choice B is incorrect because it lacks the closing comma. Choice D is incorrect because dashes must be used in pairs.