Everybody could see what appened and (that)Tony

问题描述:

Everybody could see what appened and (that)Tony
Everybody could see what appened and (that)Tony was very frightened.解释一下为什么用that

因为and连接的是see后面的两个并列的从句.前一个因为缺少宾语,所以引导词用what,而后一个不缺成分,就用that引导了.