It has been quite a long time ______ the two companies established a business relationship.

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问题 It has been quite a long time ______ the two companies established a business relationship.

选项 A、although
B、because
C、if
D、since

答案D

解析本句的意思是：自从这两家公司建立起商业关系之后已经有很长一段时间了。本题考查since构成的句型“It is／has been…(time)since…”，意为“自……以来已有……时间了”。

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