问题补充：
— I heard the phone ringing in the office next door.
— You it. They haven’t got a phone yet.
A. couldn’t hear
B. couldn’t have heard
C. didn’t hear
D. wouldn’t have heard
答案：
A. couldn’t hear
(答案→)B. couldn’t have heard
C. didn’t hear
D. wouldn’t have heard
解析：
试题分析: 句意：——我听到隔壁办公室电话一直在响。——你不可能听到的。他们还没有电话呢。根据后句可知此处是否定对方的话，是对过去的的一种否定推测，用“情态动词+have done”，couldn’t have done“不可能做过某事”，答案选B。
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