It's obviously proven a lot more difficult than a lot of us expected to pass that act.我个人认为expect跟us应该是主从关系啊,为什么不是expecting呢?如果中间省略了that,那么that 也应该是做主语,无法省略啊!

It's obviously proven a lot more difficult than a lot of us expected to pass that act.我个人认为expect跟us应该是主从关系啊,为什么不是expecting呢?如果中间省略了that,那么that 也应该是做主语,无法省略啊!
It's obviously proven a lot more difficult than a lot of us expected to pass that act.
我个人认为expect跟us应该是主从关系啊,为什么不是expecting呢?
如果中间省略了that,那么that 也应该是做主语,无法省略啊!

It's obviously proven a lot more difficult than a lot of us expected to pass that act.我个人认为expect跟us应该是主从关系啊,为什么不是expecting呢?如果中间省略了that,那么that 也应该是做主语,无法省略啊!
expected是指别人期望我们通过,应该是主宾关系=People expect us to pass that act

因为证明已经出来了，所以是我们的期望就是过去啊，所以是过去式
than后边的是一个简单句

因为它是谓语动词，than后加的a lot of us expected 是一个比较状语从句。意为：显而易见，这项法案要获得通过比我们大多数人曾预想的要困难得多。

是主格，expected 是一般过去时，因为现在已经“明显证明了”所以我们有许多人的“期待”发生在过去。可译成
“它明显证明了要通过那个法案比我们许多人原先期待的要困难得多”