单选题A
By telephoning his friend.B
By writing his friend a letter.C
By checking the post office’ s records.D
By the signature of his friend on the return receipt.
题目内容(请给出正确答案)
单选题
A
By telephoning his friend.
B
By writing his friend a letter.
C
By checking the post office’ s records.
D
By the signature of his friend on the return receipt.
