——Excuse me but could you please turn the radio down?——Sorry I you could hear it.A. don

问题补充：

——Excuse me, but could you please turn the radio down?

——Sorry, I you could hear it.

A. don’t realize

B. haven’t realized

C. didn’t realize

D. hadn’t realized

答案：

A. don’t realize

B. haven’t realized

(答案→)C. didn’t realize

D. hadn’t realized

解析：句意：打扰了，你能把收音机音量调小吗?——抱歉，我不知道你能听见。结合语境可知下文描述的是刚才发生的动作，故用一般过去时态，选C。