问题
选择题
_____ a noise just then?
A．Have you heard
B．Were you hearing
C．Are you hearing
D．Did you hear
答案
答案：D
搜题请搜索小程序“爱下问搜题”
_____ a noise just then?
A．Have you heard
B．Were you hearing
C．Are you hearing
D．Did you hear
答案：D