Question

—Tom came back home the day before yesterday.

— Really? Where __________ at all?

1. A.
   had he been
2. B.
   has he been
3. C.
   had he gone
4. D.
   has he gone

Answer 1

A
come back是过去，而问句中的动作发生在came back之前，是过去的过去，所以要用过去完成时，而且Tom已经回来，所以要用been，而gone是去了还未回来。