normal前面用什么介词

前面用介词in，例如：

1、Divorce is complicated enough in normal circumstances， but this situation is even worse.在一般情况下，离婚已经够复杂了，但这一次情况更糟。

2、In the normal course of events she would have gone with him.要是事情发展顺利的话，她已同他一块儿走了。

3、In the normal course of things we would not treat her disappearance as suspicious.在一般情况下，她不露面，我们也不会觉得有什么可疑之处。