Although（ ）primarily to promote trade relations, these agreement

Although（ ）primarily to promote trade relations, these agreements also foster technological cooperation.
A、designed
B、they are to be designed
C、it is designed
D、they are being designed
【正确答案】：A
【题目解析】：句意：这些协议虽然主要是为了促进贸易关系，但其实也促进了技术合作。although在让步等状语从句中，如果从句主语和主句主语相同，或者从句主语是it时，从句的主语和谓语动词的一部分经常省略。