, they delivered the message as quickly as they could.A. Arriving atB. On arrivingC. When

发布时间：2020-08-16 12:45:48

, they delivered the message as quickly as they could.
A. Arriving at
B. On arriving
C. When arriving
D. Arrived

网友回答

A. Arriving at
(答案→)B. On arriving
C. When arriving
D. Arrived
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