This is an incomplete thought as it does not have a subject.
Answer:
I saw <em><u>an</u></em><em><u> </u></em>accident of a car
The underlined subject of the sentence the skyscraper that was built last year is a noun phrase.When determining the type of phrase, you first need to find its center, of the most prominent word. Here, the center is skyscraper, which is a noun, which means that the whole phrase is a noun phrase.
Answer:
I think that Wolff means a concealed or closed up tape records.
Explanation: