7. In $\triangle A B C$, $\angle A B C=60^{\circ}, A D$ and $C E$ bisect $\angle B A C$ and $\angle A C B$ respectively. Then the relationship between the length of $A C$ and $A E+C D$ is ( ).
(A) $A C>A E+C D$
(B) $A C=A E+C D$
(C) $A C<A E+C D$
(D) Cannot be determined
7.(B).

Let the intersection of $A D$ and $C E$ be $O$. Take a point $F$ on $A C$ such that $A F = A E$. Connect $O F$. Then,
$\triangle A E O \cong \triangle A F O$.
Furthermore, it can be proven that
$\triangle O D C \cong \triangle O F C$.
Therefore, $A C = A E + C D$.