Three suspects in the terrorist attack in Kunming have been caught.
A. involved
B. to involve
C. being involved
D. involving
网友回答
(答案→)A. involved
B. to involve
C. being involved
D. involving
解析：句意：参与昆明恐怖袭击案的三个嫌疑人已经被抓住了。这里需要定语修饰suspects，因为be involved in“参与，牵连”，所以用过去分词做定语，选A。