it ______that pleasant music keeps people from becoming tired at their work.1.has been found2.is found为什么是1不是2

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it ______that pleasant music keeps people from becoming tired at their work.1.has been found2.is found为什么是1不是2
it ______that pleasant music keeps people from becoming tired at their work.
1.has been found
2.is found
为什么是1不是2

it ______that pleasant music keeps people from becoming tired at their work.1.has been found2.is found为什么是1不是2
It has been found that pleasant music keeps people from becoming tired at their work.[人们已经发现悦人的音乐会使人在工作中避免疲劳.]
本题应该根据句意理解吧,其中,“has been found”是被动语态的现在完成时结构,表示过去就被发现,而强调过去的发现对现在还有影响.比较符合题意.[现在完成时主要强调过去发生的动作对现在的影响或结果.]
而“is found”是被动语态的一般现在时结构,表示经常性或目前的动作或状态,相比之下较不合理.
但我觉得这种句子还应根据上下文才好作出判断.

呵呵,2号中IS FOUND 是被动语态么? 不是,又没有主语,只能是1啦

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