The accident caused by a dog running across the road, but we don’t know for sure. A．could have been...
2023-02-12 20:27:42 121次 四川省成都龙泉中学2010年高考押题卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
The accident
caused by a dog running across the road, but we don’t know for sure.
A．could have been B．must have been
C．might have D．should have
本题链接：
