correction
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
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)
sz_illina说得对
I have no idea that I should do first. that 改为 what, that 只可以替代 which, who, where etc 不可以替代what 正确的是： I have no idea what I should do first.
There are so many things to be done by me改为：There are so many things to do 不定式的主动表被动
There are so many things to be done by me. I have no idea where (that) I should do first. It's logical to put where as "where to do first".
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