The missing boy was last seen ____near the river.A playing B to be playing C play D to play ,选哪个请问为什么不选D呢?被看到、、、,不定式变为被动语态时,不是应该还原to吗?

相关推荐

• The missing boy was last seen ____ near the river.A,to play B,to be playing C,play D,playing 为什么不选A,这里被动语态应该加to啊?选什么?为什么?
• The missing boy was last seen ____near the river.A playing B to be playing C play D to play ,选哪个请问为什么不选D呢?被看到、、、,不定式变为被动语态时,不是应该还原to吗?
• The missing boys were last seen___ near the river.a,playing b,to be playing c,play d,to play选哪个,为什么?
• 完型填空The best way of learning English is buy___it and talking in it as___as possible