the teacher noticed him ____(play)basketball on the playground just now

问题描述:

the teacher noticed him ____(play)basketball on the playground just now

用playing
notice为感官动词,后面可接不带to的不定式即动词原形或者ing作为宾补.
这里用notice him playing强调老师注意到他的时候他正在打篮球,强调动作正在进行!