方法：看空格处动词与空格前名词之间的关系，若是主动就选doing,若是被动在以下情况中选：

  1. done : 被动+过去
  2. being done :被动 + 进行
  3. to be done : 被动 + 将来

:::info 1.The Great Pyramin(金字塔）bulit_nearly 5000 years ago is located on the bank of the Nile River. (2005-21)

A. built
B. was built
C. being built
D. to be bulit

be located in/on. 在…..里面/上面

分析 A. did 谓语 主动；done. 非谓语 过去分词 被动；
C. being done.非谓语 + 被动 D.非谓语 + 被

一句一谓，两谓一连
谓语动词 be + done (is located),无其他谓语，则用一句一谓，空格处用非谓语B去掉
done 过去的时间 ；to be done. 将来 being done. 现在进行
nearly 5000 years ago. 过去的时间
done :::

:::info 2.David sent his grilfriend a ring keptby his grandmother for all her life

A. have kept
B. kept
C. has kept
D. has been kept

分析A C D 谓语—-复合谓语 现在完成时态
D 被动 C主动
B done 单独的谓语 非谓语\谓语did

这句话的谓语动词 sent,再也没有其他的谓语和连词，满足一句一谓，则了空格处一定是非谓语，谓语排除A C D :::