I'm confused about a mulitple-choice question:
He didn't answer, with his gun __________ at David.
a. aims
b. to aim
c. aiming
d. being aimed
My first reaction was that the gun was aimed at David, which pushed me to choose D. However, the correct answer was C; therefore, could some friends show me some conventional ways to use the verbal phrase "aim at"? By the way, what would be the common agent of this action?