Question

della, had mastered the art. (change the voice)​

Answer 1

Answer:

Passive voice :

The art had been mastered by Della.

Answer 2

Answer:

$\huge\pink{\fcolorbox{blue}{pink}{\boxed{{\mathtt{\underbrace{\overbrace{\fcolorbox{darkgreen}{gold}{\underline{\red{☑ANSWER☑ \: }}}}}}}}}}$

The art had been mastered by Della.

$\large{\color{pink}{\textsf{\textbf{Hope~my\:answer~helps!}}}}$