when jack arrived,he learned Mary___for almost an hour.请问这个选择题哪个是对的,为什么?

题目

when jack arrived,he learned Mary___for almost an hour.请问这个选择题哪个是对的,为什么?
when jack arrived,he learned Mary___for almost an hour.
A.had gone B.had set off c.had left D.had been away
请说明为什么这么选的理由，

答案

When Jack arrived,he learned Mary___for almost an hour.A.had gone B.had set off c.had left D.had been away问题补充：请说明为什么这么选的理由,答：D译：当杰克到达时,他得知玛丽已经走了差不多一个小时了.析...