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About 1000 high school students____the distance learning cou

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About 1000 high school students____the distance learning courses since the school was set up
four years ago.
A.had taken
B.have taken
求详解
About 1000 high school students____the distance learning cou
B
A的话是用在过去的过去,句中four years ago只代表过去.就是说4年前开始有1000名学生开始学习.
A的话应该把since改成before