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单选题
It has been quite a long time _____ the two companies established a business relationship.
A
although
B
because
C
if
D
since
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参考解析
解析：
本题考查连词词义辨析。句意：两家公司确立商业关系已经很久了。if意为“如果、假设”，引导条件句；although意为“尽管、虽然”，引导让步状语从句；because意为“因为”，引导原因状语从句；since意为“自从……，既然”，引导时间状语从句。故正确答案为D。
本题考查连词词义辨析。句意：两家公司确立商业关系已经很久了。if意为“如果、假设”，引导条件句；although意为“尽管、虽然”，引导让步状语从句；because意为“因为”，引导原因状语从句；since意为“自从……，既然”，引导时间状语从句。故正确答案为D。
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