when and where后面跟单数还是复数?有一个例句是这样的.professor james will give us a lecture on the western culture,but when and where_____yet.这个空应该填的是hasn't been decided,我的问题是,这里是when and where,为什么不用haven't 而要用hasn't呢?什么情况用haven't,这个单数复数根据什么决定?
问题描述：
when and where后面跟单数还是复数?
有一个例句是这样的.professor james will give us a lecture on the western culture,but when and where_____yet.这个空应该填的是hasn't been decided,我的问题是,这里是when and where,为什么不用haven't 而要用hasn't呢?什么情况用haven't,这个单数复数根据什么决定?
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