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  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 自从两家公司建立商业关系已经相当长时间了。考点时间状语从句。
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