Question

【题目】Underground is the only word in the English language _______ begins and ends with the letters “und”.
A.what
B.that
C.who

Answer 1

【答案】B
【解析】句意：underground（地铁）是英语中唯一一个一und开始又以und结尾的单词。这是一个定语从句，先行词是the only word，关系词在从句中作主语，指物，用that；what不引导定语从句；who指人，所以答案是B。