It’s five years since I was a singerNot really! ?A. Are you a singerB. How’s tha

问题补充：

--- It’s five years since I was a singer.

--- Not really! ?

A. Are you a singer

B. How’s that

C. What do you mean

D. Is it a strange idea

答案：

A. Are you a singer

(答案→)B. How’s that

C. What do you mean

D. Is it a strange idea

解析：考查情景交际和since的用法。since后加延续性动词或状态性动词时，意自从为“某动作结束”有多长时间了。Was是状态性动词，句意是“我不当歌手已经五年了”。对方听了之后感到惊讶，Not really!这里表示惊讶，即“不是真的吧！”，后面接“How is that？”意为“怎么会这样？”。故选B。