The Mekong River, which several countries in Southeast Asia, to be playing a significant role in the region.
A. links; is considered
B. has linked; considers
C. is linked; is considered
D. links; considers
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(答案→)A. links; is considered
B. has linked; considers
C. is linked; is considered
D. links; considers
解析：动词辨析。Link sth联系sth；be linked to 与…有联系；consider sb/sth to be/as…认为某人是…句意：连接东南亚好几个国家的湄公河被认为在地区中将会起重要作用。