分类：教育/科学-外语学习-英语考试
问题：Whocanhelpme?谁能告诉我答案:改写为同意句:Idon 
谁能告诉我答案:
改写为同意句:
I don't know which flat I'll buy.
I don't know ____ ____ ____ buy.
回答：I don't know which flat I'll buy. 
I don't know _which_ _flat _to_ buy.
都表示主语的动作，只不过表达形式一个用从句，一个用动词不定式。