After boarding the train, please maintain a firm handhold _隨時__at all times___
上火車後,請保持緊握扶手
(a)all the time一直(b)at the time在那時候(c)at times有時.偶爾(d)隨時
all the time=一直,表一段區間內,可以做+可以不做,辭意上較為輕鬆
at all times=隨時,表一段區間內,必須持續一直做,辭意較為嚴格
12. After boarding the train, please mai..-阿摩線上測驗