They were all standing on the playground, white suit.
A. all wearing
B. all wore
C. all were wearing
D. all of whom wearing
网友回答
(答案→)A. all wearing
B. all wore
C. all were wearing
D. all of whom wearing
解析：考查独立主格结构：They were all standing on the playground,中间没有连词，说明有可能说是定语从句或独立主格结构，D项用了whom但是又缺少谓语，BC有谓语但是没有关系代词，选A。all是逻辑主语，wearing是现在分词做状语。