The answer is "It was a common sight to see her staying late in the library, huddled over her trusted, beat-up laptop, helping someone."
Answer:
B.
Explanation:
A gerund is a noun derived from a verb, a noun that usually ends in -ing.
In this case, the word "waiting" is both a subject and a gerund.
From what i read it would have to be D
1.
cause the water or other liquid in (something) to run out, leaving it empty or dry.
2.
deprive of strength or vitality.
The answer should be a :)