Question

fix the one word that is used incorrectly.

the physics professor asked the class, \does time proceed from past to present,
and on into the future, or is the concept of time simply an allusion?\

Explanation:

The word "allusion" refers to a reference to another work or concept, which does not fit the context of questioning the reality of time. The correct word here is "illusion", which means a false perception or belief, matching the professor's question about whether time is a misleading concept.

Answer:

Replace "allusion" with "illusion". The corrected sentence is: The physics professor asked the class, "Does time proceed from past to present, and on into the future, or is the concept of time simply an illusion?"