We"d better to call the police at once.

We"d better call the police at once.
We"d better后加的是原形

比方说
You would better not say that.你最好别说那样的话。

标准答案：
had better do sth
后面直接加动词原形
改成
We'd better call the police at once.
就对了

"d better 后面是不是不能用to啊，要用原型直接用call

We"d better call the police at once.
We"d better后加的是原形

We'd better call the police at once.
had better do sth.

We"d better to call the police at once.
We"d better call the police at once.