问题
选择题
_________, they delivered the message as quickly as they could.
A．Arriving at
B．On arriving
C．When arriving
D．Arrived
答案
答案：B
搜题请搜索小程序“爱下问搜题”
_________, they delivered the message as quickly as they could.
A．Arriving at
B．On arriving
C．When arriving
D．Arrived
答案：B
