The traffic problems have severely affected economic development. , we must spare no efforts to solve them.
A. Furthermore
B. Therefore
C. Meanwhile
D. Nevertheless
网友回答
A. Furthermore
(答案→)B. Therefore
C. Meanwhile
D. Nevertheless
解析：副词辨析。A而且,此外,再者；B因此；C与此同时；D然而；本句上下文构成因果关系。句意：交通问题已经严重影响了经济发展，因此，我们必须不遗余力的解决它。