When ____ ,the new stadium will hold 50,000 people .A complete B to complete C completing D completed

When ____ ,the new stadium will hold 50,000 people .A complete B to complete C completing D completed
When ____ ,the new stadium will hold 50,000 people .
A complete B to complete C completing D completed

When ____ ,the new stadium will hold 50,000 people .A complete B to complete C completing D completed
D
因为主语是the new stadium ,意思是当新体育馆被建成后,能容纳50000人,体育馆是被建的,用被动