When Steven suddenly remembered that he had left his mobile in the office, the train was already ___

题目简介

When Steven suddenly remembered that he had left his mobile in the office, the train was already ________.

A．on the go

B．on the rise

C．on the run

D．on the move

题型：单选题难度：中档来源：不详

试题分析：考查介词短语。A忙碌；B上涨；C在逃，奔波；D在移动中。句意：当史蒂夫突然想起来他的手机落在办公室的时候，火车已经开动了。故选D。