为什么要用playing?The missing boys were last seen (playing )near the river.A.playing B.to be playing C.play D.to play 其它答案为什么不能用?

is the girl are playing the piano?这句话为什么要用are playing谢谢! Look!There are a lot of children playing in the ground.为什么要用playing而不用are playing the pupils of class three like playing football.(为什么要用like playing?) We had great fun playing in the water 为什么要用playinWe had great fun playing in the water为什么要用playing 为什么要用playing?The missing boys were last seen (playing )near the river.A.playing B.to be playing C.play D.to play 其它答案为什么不能用? it’s exciting to spend time ( playing ) in the snow with friends.这里为什么要用playing How old were you when you first stated playing the piano中,为什么要用playing呢 I like to watch the children playing games on the playground为什么用playing 什么时候用play,什么时候用playing例句：Listen!The boy is ___(play) the piano in the music room.___处为什么要填playing He likes playing the piano.playing”是现在进行时,那么“like”为什么要加s? I practise playing the piano中“playing”为什么要加ing? We had great fun playing in the water.这里为什么用playing不怕深奥 Tom likes playing the piano while Tim likes playing football.这里为什么用while the children have fun playing in water这里为什么用playing而不是to play? 孩子们正在打篮球 the children are playing basketball.为什么用 playing the boy spends most of his time playing computer games为什么用playing the boy stayed up all night playing computer games.为什么用playing. they were playing volleyball on the beach yesterday.为什么过去式用“playing”ing形式?