--Did a letter come for me?Yes came for you this morning.A. thatB. itC. oneD. the let

问题补充：

--Did a letter come for me?

--Yes, came for you this morning.

A. that

B. it

C. one

D. the letter

答案：

A. that

B. it

(答案→)C. one

D. the letter

解析：one 指one letter.