单选题 Our new teacher is much younger than his ______.
[A] successor [B] predecessor [C] colleague [D] workmate

【正确答案】 B
【答案解析】predecessor前任，前辈；successor (to)接替人，继任者；colleague同事，同僚；workmate工友。句意：我们的新老师比他的前任年轻很多。