Our containers are in conformity with the specifications_

Our containers are in conformity with the specifications______by the International Standardization Organization.
A、laid down
B、lay down
C、lied down
D、lie down
【正确答案】：A
【题目解析】：lie down表示“躺下”;lay down表示“阐述，声明，规定”;lay的过去分词为laid。