The window is broken but nobody knows who( ) it A breaks B b

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The window is broken but nobody knows who( ) it A breaks B broken C has broken D break
选什么,要有讲解

选A
这里考虑时态,用的是一般现在时,who作单数处理,所以要用到breaks.
再问： Mary ___(lose) her pen ._____you______(see) it here and there
再答：其实用过去时好一点，因为是发生过的事情，但是选项中没有broke. 为什么不用完成时呢？这个不需要强调对现在的影响。 Mary lost her pen. Have you seen it here and there?
再问：这个为什么用过去完成时？？
再答：这个用的是现在完成时，“你在周围看到了吗？”这个强调影响，看到了就帮忙找出来。其实英语比较讲“语感”，不像数学公式，肯定是或肯定不是，而是有一个更适合，更恰当的选择。

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