Synthesized answer
The provided passages do not contain information about what questions remain unanswered in "Critique of Practical Reason" [1]. The passages focus on the translation and introduction to the work, highlighting the translator Werner Pluhar's accomplishment and Stephen Engstrom's discussion of the book's place within Kant's philosophy [1].
Therefore, I cannot answer what questions remain unanswered based on the given text.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: Critique of Practical Reason by Immanuel Kant Description: With this volume, Werner Pluhar completes his work on Kant's three Critiques, an accomplishment unique among English language translators of Kant. At once accurate, fluent, and accessible, Pluhar's rendition of the Critique of Practical Reason meets the standards set in his widely respected translations of the Critique of Judgment (1987) and the Critique of Pure Reason (1996). Stephen Engstrom's Introduction discusses the place of the second Critique in Kant's critical philosophy, its relation to Kant's ethics, and its…