21. The winning of hosting _______ 2010 World Expo is _______ victory not only for Shanghai residents, but for ___________ people of the whole Chinese nation.

A．the; a; the

B．a; the; a

C．a; a; the

D．the; the; a

缩剪可以在幼树上应用，不用于成年树、特别是需要更新复壮的衰弱树。