Question

--Where did you go the day before yesterday? --I( ——)Shanghai for two days.

A have been in
B had been in
究竟应该选哪一个，给出原因。
参考书上说的是B，我也闹不清楚了。请各位详细浅显一点。

Answer 1

选B
Where did you go the day before yesterday? --I( have been in )Shanghai for two days.
你前天去哪里了? --我去了上海2天.
明显是过去完成时.(过去在上海,现在不在了)
而have been是现在完成时.

过去完成时和现在完成时的区别:
过去完成时动作发生在过去的过去。试比较以下现在完成时和过去完成时的两个句子
如: He has been to Beijing twice. 他已经去过北京两次 （现在完成时）
He said he had been to Beijing twice. 他说他已经去过北京两次。（因为“说”said就是过去式，而去北京的动作发生在说said 的过去，所以用过完而不用现完。
过去完成时常用的时间状语有 1. by the end of last year.
By the end of last term, we had learned 5000 new words.
2. By the time sb. +动词过去式 如：The bus had already left by the time I got there.
3. 宾语从句

Answer 2

B
选B，是过去完成时，因为回答者现在已经不再上海了。提问者问的是：你前天去哪里了？根据这个可以判断，回答者在上海待了两天（前天和昨天），今天肯定不在上海了。因此要用过去完成时。

Answer 3

B 到过去为止的一段时间。现在应该回来了

Answer 4

B
问句用的是过去式，所以前后一致，要用had，过去完成式

Answer 5

应该选B
the day before yesterday是一个过去的时间，在他之前两天是过去的过去，所以应该用过去完成时，所以应该选B。

Answer 6

A