why is Harrison Bergeron’s character considered a danger to society?
it is b
urwelcome
You are right, the prepositional phrase in the sentence <em>Late last night there was a loud knock at the door </em>is D) at the door.
The only preposition in the sentence is <em>at, </em>therefore this has to be correct.
A simile becomes a cliche when it is overused. Pretty much any word or sentence formation becomes a cliche when overused, not just similes. An example of this would be saying that someone is "as blind as a bat", which has already become recognizable and widely used, making it a cliche.
