单选题It has been quite a long time _____ the two companies established a business relationship.AalthoughBbecauseCifDsince

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


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。

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