during the war ,an Englih pilot was hurt ,but he was ()by a group of nuns .A caught B savedC killed D helped.请问这个句子中已经有了was 了而各选项又都是动词,这是个什么语法,选完后回答.

问题描述:

during the war ,an Englih pilot was hurt ,but he was ()by a group of nuns .A caught B saved
C killed D helped.请问这个句子中已经有了was 了而各选项又都是动词,这是个什么语法,选完后回答.