We believe that with the joint efforts of our two cities，the friendly cooperation between us will develop further．
【正确答案】
B
【答案解析】B)一C)一A)。本题解题关键在于对介词短语with the joint efforts和宾语从句中的develop further的理解。with the joint efforts意为“在共同努力下”；develop further意为“进一步发展”。