Question

The missing boys were last seen__________nearthe river．

A.playing
B.to be playing
C.play
D.to play

Answer 1

【答案】：A

【考点】固定搭配

【解析】本句意为：那些失踪的男孩们最后被看到时正在河边玩。see sb．doing sth．“看见某人正在做某事”；see sb．do sth．“看见某人做了某事”。故本题选A。