Question

The missing boys were last seen__________ near the river．

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

Answer 1

【答案】：A

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