单项选择题

They decided to take some actions ______ the situation turned too bad.

A．until
B．unless
C．when
D．before
<上一题 目录 下一题>
热门 试题

单项选择题
______ worked harder, he would have passed the exam.
A．He had
B．When he
C．If he
D．Had he
单项选择题
It was not until the accident happened
A．that I realized my carelessness
B．when I realized my carelessness
C．as I realized my carelessness
D．when my carelessness has been realized
相关试题