问题
单项选择题
I was writing in my room （） a ball broke window.
A．when
B．as
C．where
D．while
答案
参考答案：D
搜题请搜索小程序“爱下问搜题”
I was writing in my room （） a ball broke window.
A．when
B．as
C．where
D．while
参考答案：D