单选题 The wooden cases must be secured by overall metal strapping so that they can be strong enough to stand rough handling during ______.

【正确答案】 A

【答案解析】transit意为“搬运，运输”；motion意为“运动，动作”；shift意为“转移，挪动”；traffic意为“交通，运输”。句子的主语是The wooden cases，根据前面的 to stand rough handling可知，应选transit。