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。