Mary ________ (write) a letter to her friend a night.

　　But I don't know if she finished it.

As soon as she finished ______ the letter, she posted it.

[    ]

Wendy continued ________ TV after she finished ________ the letter to her friends．

1. A.
   watching; writing
2. B.
   to watch; to write
3. C.
   watch; to write
4. D.
   watching; to write