问题
选择题
The parents waved and _____ the train until it was out of sight.
A．saw
B．noticed
C．observed
D．watched
答案
D
搜题请搜索小程序“爱下问搜题”
The parents waved and _____ the train until it was out of sight.
A．saw
B．noticed
C．observed
D．watched
D