#英语四级考试技能训练结构词汇练习三3 搜索结果
18.Nosooner________thanthefirebrokeout.A)hehadfledthehouseB)hadhefledthehouseC)hefledthehouseD)didhefleethehouse19.Oneshouldbecarefultocheckthegrease（润滑油）andoilin________atregularintervals
