问题补充:
The passengers were in the traffic congestion which resulted from the accident ahead.
A. held out
B. held back
C. held up
D. held on
答案:
A. held out
B. held back
(答案→)C. held up
D. held on
解析:句意:乘客由于前面的交通被阻挡在路上。hold out坚持;hold back隐瞒; hold up阻隔,阻挡;hold on继续。根据句意故选C。