human
In the following sentence, insert a word that comes from "virtue" wherever there's "..." : "After about 1600 the civilization began to collapse, and had ... disappeared by the mid-19th century."
gpt
--- Reasoning ---
1. Is the question multiple-choice question?
No
2. Is it implied multiple-choice question?
No
3. If two experts were independently asked the question, will the final answer be exactly the same?
No

--- Answer ---
open