before 引导时间状语从句Students _____ to close the windows before they leave the physics and chemistry.答案说是are told ,为什么不是will be told?

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before 引导时间状语从句
Students _____ to close the windows before they leave the physics and chemistry.答案说是are told ,为什么不是will be told?

时态前后一致,句中没有暗示除一般时态以外的词,比如说动词的过去时态,will ,would等等,就用一般时态.