____the building for stolen goods,the police found twenty machine guns.
问题描述：
____the building for stolen goods,the police found twenty machine guns.
A.searching
B.being searching
C.searched
D.to search
为什么选A?这是独立主格的哪种形式?怎么分析独立主格?
答
Searching the building for stolen goods为动名词短语作句子的状语,句子意思是：
在为被盗物搜查建筑时,警察发现了20把机关枪.