2道单选题The missing boy was last seen ___ near the river.A.play

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2道单选题
The missing boy was last seen ___ near the river.A.playing B.to be playing C.play D.to play 为什么不选B?
He was often heard___ the International.A.sing B.to sing C.sang
D.to be singing 为什么?能不能添singsing?
这两道题感觉差不多啊.

1.see somebody do/doing 看到某人在做某事,用playing表示最后被人看到时,正在河边玩,选A
2.hear somebody do/doing听到某人做某事,
可以用singing,或是to be singing,选D
他经常被人听到在唱国际...（ing形式表示习惯性的行为）

2道单选题The missing boy was last seen ___ near the river.A.play The missing boy was last seen ___ near the river. The missing boy was last seen ____ near the river. 1.The missing boy was last seen ____ near the river.A.playin The missing boy were last seen ________ near the river. The missing boy were last seen near the river The missing boy was last seen __________ by the river. The ____ (miss)boy was last seen ____ (play)near the river . The ___boy was last seen near the river A missing; playing B The missing boy was last seen ____near the river.A playing B The missing boys were last seen _____________ near the river The missing boys were last seen（） near the river.