This is one of the most interesting films shown last week.A which wasB that wasC

问题补充：

This is one of the most interesting films shown last week.

A which was

B that was

C which were

D that were

答案：

解析：考查定语从句中that的用法和主谓一致。句意“这是上周上映的最有趣的电影之一。”先行词films有最高级修饰，故只能用that引导定语从句。当先行词有序数词、最高级或不定代词修饰时，当先行词既有人又有物时，只能用that。先行词filns是复数，故定语从句的谓语用复数。故选D。