Dr. Elena Rodriguez _______ has published over fifty peer-reviewed papers _______ will deliver the keynote address at the conference.
Which choice completes the text so that it conforms to the conventions of Standard English?
, who has published over fifty peer-reviewed papers,
who has published over fifty peer-reviewed papers
, who has published over fifty peer-reviewed papers
who has published over fifty peer-reviewed papers,
Correct Answer: A
Choice A is the best answer. This question tests comma usage with nonessential (nonrestrictive) clauses.
- Context clues: The "who" clause provides extra information about Dr. Rodriguez but isn't essential to identify her.
- Meaning: Nonessential clauses are set off by commas on both sides.
- Verify: "Dr. Elena Rodriguez, who has published..., will deliver..." correctly brackets the nonessential clause.
💡 Strategy: Set off nonessential/nonrestrictive clauses with commas on both sides.
Choice B is incorrect because it lacks both commas needed for nonessential information. Choice C is incorrect because it lacks the closing comma. Choice D is incorrect because it lacks the opening comma.