--- I’m sorry, but there’s no smoking on this flight.

    --- Oh, I ______ that. Sorry, I won’t again.

    A. don’t know             B. didn’t know 

    C. won’t know             D. haven’t known

--I’m sorry, but there’s no smoking on this flight.

--Oh, I _______ that. Sorry, I won’t again.

1. A.
   don’t know
2. B.
   didn’t know
3. C.
   won’t know
4. D.
   haven’t known

---I’m sorry, but there’s no smoking on this flight.

---Oh, I______ that. Sorry, I won’t again.

A. don’t know.    B. didn’t know.     C. won’t know    D. haven’t known.

---I’m sorry, but there’s no smoking on this flight.

---Oh, I______ that. Sorry, I won’t again.

A．don’t know.          B．didn’t know.           C．won’t know               D．haven’t known.

—I’m sorry, but there’s no smoking on this flight.

—Oh, I______ that. Sorry, I won’t again.

A. don’t know　 B. didn’t know　 C. won’t know　 D. haven’t known