I have to post the letters. I wrote them this morning.

A. I have to post the letters which I wrote them this morning.

B. I have to post the letters which I wrote this morning.

C. I have to post the letters which wrote them this morning.

D. I have to post the letters which wrote this morning.

Đề luyện thi Tiếng Anh vào 10. Đề 2.2018