分类：教育/科学-外语学习-英语考试
问题：correctionTherearesomanythingsto 
There are so many things to be done by me. 
I have no idea that I should do first.

有一个错误，请改正
为什么
回答：将that改为which是对的
既然句中提到的是to do first,从逻辑上讲肯定是有几件事可以供我选择,而我不知道该将哪一个作为首选,而在众多选项中选择一个只能用which是最恰当 
若用what则句子应该是I have no idea what to do.(没有first)