has the teacher decided who---(take)part in the sports meeting?为什么填will take

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hastheteacherdecidedwho---(take)partinthesportsmeeting?为什么填willtakehastheteacherdecidedwho---(take)p

has the teacher decided who---(take)part in the sports meeting?为什么填will take
has the teacher decided who---(take)part in the sports meeting?
为什么填will take

has the teacher decided who---(take)part in the sports meeting?为什么填will take
主句为现在完成时,即has decided,所以宾语从句可以用任何时态.
由句意“老师还没有决定谁将要参加运动会”可知参加运动会这个动作还没有发生,所以从句用will take.

参加运动会这个动作还没有发生,所以用一般将来时

老师已经决定谁将参加运动会了吗?
还没参加,所以用将来时will take
主句是现在完成时,是一种现在时,从句 可以用任意时态。