Noonecanwalkthewirew的精選

問題詳情：Noonecanwalkthewirewithoutabitoffearunless________veryyoung.A．havingbeentrained B．trainedC．tobetrained D．beingtrained【回答】B[此句表示被動動作。]知識點：非謂語動詞題型：選擇題...