---I called you just now, but you weren’t in.

---Sorry. I ________ the reading-room.

1. A.
   was in
2. B.
   have gone to
3. C.
   studied
4. D.
   had been to

--I called you just now, but you weren’t in.

--Sorry, I ______ the reading room.

A. was in　　 B. have gone to　　 C. studied　　 D. had been to

—I called you just now, but you weren’t in.

—Sorry. I ________ the reading-room.

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