--- Who’s the man over there?

--- It’s Jack.　

--- Oh? ______ in Italy.

1. A.
   I think he’s
2. B.
   I’ve thought he’s been
3. C.
   I thought he was
4. D.
   I’d thought he’d been

--- Who’s the man over there?

  　--- It’s Jack.

  　--- Oh? ______ in Italy.

    A. I think he’s   

    B. I’ve thought he’s been

    C. I thought he was 

    D. I’d thought he’d been