试题题干
Fill in the blanks with the words given in brackets. Make changes or add something where necessary.
I don’t know 
(who) I ought to address the request.
参考答案
试题解析
主句完整，从句还原语序为I ought to address the request to whom。故用to whom。
Fill in the blanks with the words given in brackets. Make changes or add something where necessary.
I don’t know (who) I ought to address the request.
主句完整，从句还原语序为I ought to address the request to whom。故用to whom。