A) Corn is ground by those mills.
B) Corn was ground by those mills.
C) Corn has been ground by this mill.
D) None of these
🧠 Explanation:
Active: “These mills grind corn” becomes passive: “Corn is ground by those mills.” Studying this highlights grammar, a key topic in language studies. It ensures understanding of voice transformation, with implications for clear writing in formal or technical contexts, enhancing sentence variety.
