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

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.
lxhxl12345 1年前 已收到1个回答 举报

8101 幼苗

共回答了14个问题采纳率:85.7% 举报

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)

1年前

6
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