The businessperson wanted to sell his goods fast: , he chose his partner with great care.
A. and
B. otherwise
C. however
D. therefore
网友回答
A. and
B. otherwise
C. however
(答案→)D. therefore
解析：and属于并列连词，后面要直接加并列成分，不要有逗号。B否则，要不然；C然而；D因此；句义：这位商人想快点把货物卖掉，因此他很细心的选择同伴。根据句义说明上下文存在着因果关系。故D正确。