—Tom came back home the day before yesterday.— Really? Where at all?A. had he beenB. has

问题补充：

—Tom came back home the day before yesterday.

— Really? Where at all?

A. had he been

B. has he been

C. had he gone

D. has he gone

答案：

(答案→)A. had he been

B. has he been

C. had he gone

D. has he gone

解析：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。