Among the workers who built the stadium____ ,who used to live in the countrside 求达人讲解,

问题描述:

Among the workers who built the stadium____ ,who used to live in the countrside 求达人讲解,
A are the peasants B the peasants are
C were the peasants D the peasants were

D the peasants were
Among the workers who built the stadium
在建体育场的工人之中,
介词短语,不是句子主要成分,
the peasants 才是主语,
the peasants used to live in the countrside
农民们过去住在乡下
这是原句.
用过去式是因为前面的:
(Among the workers who built the stadium )也用了过去式
在所给句子中,后面用了定语从句.