he put them high __ the balcony where people sat looking down __ the plays A.in;onA.in;on B.on;at C.on;on D.at;on选B说一下理由

问题描述:

he put them high __ the balcony where people sat looking down __ the plays A.in;on
A.in;on B.on;at C.on;on D.at;on
选B说一下理由