anhour前用什么介词

前边加介词of，例如：

1、We had to queue up for an hour for the tickets.我们只得排一个小时的队买票。

2、They had to sit in the waiting room for an hour.他们不得不在候车室里等了一个小时。

3、I waited for an hour and then I left.我等了一个小时，然后就走了。