Question

Russia’s president fires senior military officers for failin

Answer 1

A

考查非谓语动词。stop...from doing,其中from可以省略变成stop... doing...意思是组织做某事。这里意为‘阻止海军基地被大火烧毁’所以要用被动语态be done，于是就变成了‘stop a naval base being swept’。