问题
选择题
—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
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。