He wolfed down his lunch. In the sense of word formation, the wo

He wolfed down his lunch. In the sense of word formation, the word wolfed is formed by ( ).
【正确答案】：CONVERSION
【题目解析】：本题考查构词法的应用。 wolf本身是名词：狼，转类成动词，可以变换时态，加了-ed，变成了一般过去时，表示狼吞虎咽地吃，所以使用了转类法。conversion：转类法