Either you or the headmaster the prizes to those students

问题描述:

Either you or the headmaster the prizes to those students
Either you or the headmaster ____ the prizes to these
gifted students at the meeting.
A.is to hand out B.is handing out
C.are to hand out D.are handing out
为什么不选B而选A

be to do = is going to do/ will do表示将来.B是现在进行时
句子是“你或者校长会在大会上为这些天才的学生颁奖”
either...or...后一般不跟进行时