Question

---Who's the post card ______?

---My uncle．Let me take it to my mother．

1. A.
   for
2. B.
   from
3. C.
   to
4. D.
   about

Answer 1

B
“一张由某人邮给某人的明信片”，要表示成a post card from sb．to sb．，所以A、D首先排除；而下文中“我把它拿给我妈妈”，表示收信人为my mother，即to的宾语为my mother，所以my uncle一定为邮信人，前面的介词要用from．