I don't know where I can post this letter .=I don't know _ _ _this letter .
问题描述:
I don't know where I can post this letter .=I don't know _ _ _this letter .
答
where to post
答
I don't know where to post this letter .
答
填 how to send
I don't know how to send this letter
我不知道该怎样寄出这封信