Question

The missing boys were last seen _______ near the river. A．to play B．to be playing C．play

The missing boys were last seen _______ near the river. A．to play B．to be playing C．play D．Playing

Answer 1

D

试题分析：考查感官动词的复合结构。所填的词为主语补足语，因其后有明确的地点，补足语表示动作当时正在进行中，所以只能使用playing。也就是说，这里使用的是see sb. doing sth.这一结构，而不是see sb. do sth.这一结构。句意：这个失踪的男孩最后一次被看到时正在河边玩。