be terrified at/with

1. 被……吓一跳

The small girl was terrified at that big black cat.

小女孩被那只大黑猫吓了一跳。

be terrified of

1. 对……感到害怕

The child would be terrified of being left alone in the big house.

这孩子一个人留在那座大房子里会感到害怕的。