Question

- How long _______ home?
-For about three months

1. A.
   have you been away from
2. B.
   did you leave
3. C.
   have you left
4. D.
   are you away from

Answer 1

A
考查现在完成时。“你离开家多久了？”“大约三个月了。”动作发生在过去，对现在造成的影响，用现在完成时，完成时常与一段时间连用。Leave是短暂性动词，不能与一段时间连用，应该转换为be away。故选A。