I have a letter____ but i'm too busy.------------Why not have your son_____it for you?A.to post;postB.posted;postC.to post;to postD.post;post 请说明一下为什么

I have a letter____ but i'm too busy.------------Why not have your son_____it for you?A.to post;postB.posted;postC.to post;to postD.post;post 请说明一下为什么 l have some letter____ the boss said to the secretary.A.to type B to be type C typing D.typed What letter is a question?It's the letter____!什么信件是问题?它是信件____! The letter____ in French is to Li Lei.A.writes B.is written C.written D.writing I have a desk.I have a I have a dog. I have a beautiful i have a I have got a I have a great i have a chance I have a headache I have a bag. I have a I have a question! i have a h____family I gonna have a I have a bad