In order not to be held ____in the traffic jam ,they went to Pudong Airport by train.
问题描述：
In order not to be held ____in the traffic jam ,they went to Pudong Airport by train.
填一个介词,up.我想问为什么,
答
hold up 阻挡的意思
为了不被堵车阻挡,他们乘地铁去浦东机场