问题
选择题
They didn't go to bed ______ they finished their homework. [ ]
A. until
B. because
C. when
D. if
答案
答案：A
搜题请搜索小程序“爱下问搜题”
They didn't go to bed ______ they finished their homework. [ ]
A. until
B. because
C. when
D. if
答案：A