There must be many people for their trains at the train station because of the golden we

问题补充：

There must be many people for their trains at the train station because of the golden week holiday.

Aare waiting

B. waited

C. to wait

D. waiting

答案：

A. are waiting

B. waited

C. to wait

(答案→)D. waiting

解析：句意：因为黄金周，在车站一定有很多人在等待他们的火车。本题考查There must be sb doing sth.某地一定有人在做某事。根据句型，故选D。