How long have they France?- For about half a year.A. been toB. gone toC. gone inD.

问题补充：

--- How long have they France? --- For about half a year.

A. been to

B. gone to

C. gone in

D. been in

答案：

A. been to

B. gone to

C. gone in

(答案→)D. been in

解析：本题的含义是他们在法国一直呆了多长时间，have或has been in表示一直呆在某地，故本题选D。