Is can't find my pen .Where is it?Do you know?Sorry,I________.
Sorr,I后面填什么 ..
人气：463 ℃ 时间：2019-10-23 05:38:22
解答
I don't.
前文用了do提问,后文说对不起,就是不知道,所以回答也用助动词回答,所以是don't.
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