2. 专升本
  3. It has been quite a long time ________ the two companies established a business relationship.

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 句意：两家公司建立业务关系已经有好长时间了。前半句的意思为“已经好长时间了”，且使用现在完成时；后半句的意思为“两家公司建立业务关系”，且使用一般过去时。这是典型的since引导的时间状语从句，从句用一般过去时，主句用现在完成时，所以选项D为正确答案。
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