高等继续教育 / 大学英语语法
正确率：100%
题型描述: 单选题
You should exercise vigilance ＿＿＿＿ you should be killed.
A.so that
B.on condition that
C.therefore
D.lest
You should exercise vigilance ＿＿＿＿ you should be killed.
A.so that
B.on condition that
C.therefore
D.lest
参考答案：