51. --- Who is at the _____ of all this trouble. --- I don’t know. A．base B．bottom C．reason D．Cause
2023-01-30 08:30:33 13次 2010届高考二轮复习必备词汇及应用训练系列：名词（一） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
51. --- Who is at the _____ of all this
trouble.
--- I don’t know.
|
A．base
|
B．bottom
|
C．reason
|
D．Cause
|
本题链接：
