18. (6 points) $A, B, C, D, E$ five people participate in a dart game, where only one person hits the center of the dartboard, but it is unknown who did it.
$A$ says: “If it wasn't me, then it must be $C$.”
$B$ says: “It wasn't $E$.”
$C$ says: “If it wasn't $D$, then it must be $B$.”
$D$ says: “It wasn't me, nor was it $B$.”
$E$ says: “It wasn't $C$, nor was it $A$.”
Among the five, only two are telling the truth, from which we can determine who hit the center of the dartboard.
【Answer】Solution: $A$ says, "If it wasn't me who hit it, then it must be $C$ who hit it." $E$ says, "It wasn't $C$ who hit it, nor was it $A$ who hit it," which reveals a contradiction between $A$ and $E$;
$C$ says, "If it wasn't $D$ who hit it, then it must be $B$ who hit it." $D$ says, "It wasn't me who hit it, nor was it $B$ who hit it," which reveals a contradiction between $C$ and $D$;

Therefore, one of $A$ and $E$ is correct, and one of $C$ and $D$ is correct, making 2 correct statements in total. From this, we can conclude that $B$'s statement must be incorrect;
$B$ says, "It wasn't $E$ who hit it." This statement is incorrect, so it must be $E$ who hit it.
Answer: The person who hit the center of the dartboard is $E$.
The answer is: $E$.