问题
选择题
I was reading attentively in my own room _____ suddenly he knocked at the door. [ ]
A. when
B. while
C. then
D. as
答案
答案：A
搜题请搜索小程序“爱下问搜题”
I was reading attentively in my own room _____ suddenly he knocked at the door. [ ]
A. when
B. while
C. then
D. as
答案：A