问题
选择题
The missing boys were last seen _____ near the river.
A．playing
B．to be playing
C．play
D．to play
答案
答案：A
现在分词作主语补足语，表示进行。
搜题请搜索小程序“爱下问搜题”
The missing boys were last seen _____ near the river.
A．playing
B．to be playing
C．play
D．to play
答案：A
现在分词作主语补足语，表示进行。