他不知道外面正在发生事.He didn't know __________________outside.
问题描述：
他不知道外面正在发生事.He didn't know __________________outside.
答
He didn't knowwhat was happening outside.
祝你开心.there were something happening对吗？单独看这个句子对。如果放在上面所给的句子中就不行了。必须用what 指代所发生的事。