The experiment seemed to be proceeding perfectly _______ until the sudden power outage.
6
readingWhich choice completes the text so that it conforms to the conventions of Standard English?
A
perfectly,
B
perfectly;
C
perfectly:
D
perfectly—
Correct Answer: D
Choice D is the best answer. This question tests dash usage for abrupt shift.
- Context clues: There's a sudden interruption of the positive situation.
- Meaning: A dash signals an abrupt change or unexpected turn.
- Verify: "The experiment seemed to be proceeding perfectly—until the sudden power outage" conveys the abrupt shift.
💡 Strategy: Use a dash before an abrupt qualifier or unexpected interruption.
Choice A is incorrect because a comma doesn't convey the abruptness. Choice B is incorrect because a semicolon requires two independent clauses. Choice C is incorrect because a colon introduces explanation, not abrupt change.