问题
选择题
While writing a letter, _____. [ ]
A. the door bell rang
B. the door bell rings
C. I heard the door bell ring
D. I heard the door bell rings
答案
答案：C
搜题请搜索小程序“爱下问搜题”
While writing a letter, _____. [ ]
A. the door bell rang
B. the door bell rings
C. I heard the door bell ring
D. I heard the door bell rings
答案：C
