_______ scientists are now exploring new methods to reduce plastic waste in our oceans.
1
readingWhich choice completes the text so that it conforms to the conventions of Standard English?
A
Concerned about the environment,
B
Concerned about the environment
C
Concerned, about the environment,
D
Concerned about the environment;
Correct Answer: A
Choice A is the best answer. This question tests comma usage after introductory participial phrases.
- Context clues: A participial phrase ("Concerned about the environment") introduces the main clause.
- Meaning: Use a comma after an introductory phrase before the main clause.
- Verify: "Concerned about the environment, scientists are now exploring..." correctly separates the introductory phrase.
💡 Strategy: Use a comma after introductory participial phrases that modify the subject.
Choice B is incorrect because it lacks the required comma. Choice C is incorrect because the comma after "Concerned" incorrectly splits the phrase. Choice D is incorrect because a semicolon cannot connect a phrase to an independent clause.